Convert readthedocs links for their .org -> .io migration for hosted …

…projects

As per [their blog post of the 27th April](https://blog.readthedocs.com/securing-subdomains/) ‘Securing subdomains’:

> Starting today, Read the Docs will start hosting projects from subdomains on the domain readthedocs.io, instead of on readthedocs.org. This change addresses some security concerns around site cookies while hosting user generated data on the same domain as our dashboard.

Test Plan: Manually visited all the links I’ve modified.

README.rst

@@ -18,8 +18,8 @@ Glue is a simple command line tool to generate sprites::
 
     $ glue source output
 
-* The latest documentation is available at: http://glue.readthedocs.org
-* Installation instructions: http://glue.readthedocs.org/en/latest/installation.html
+* The latest documentation is available at: https://glue.readthedocs.io
+* Installation instructions: https://glue.readthedocs.io/en/latest/installation.html
 * Glue-users mailing list: https://groups.google.com/forum/#!forum/glue-users
 
 Features
@@ -31,18 +31,18 @@ Features
   - json (array, hash)
   - CAAT
 
-* Automatic multi-dpi `retina <http://glue.readthedocs.org/en/latest/ratios.html>`_ sprite creation.
+* Automatic multi-dpi `retina <https://glue.readthedocs.io/en/latest/ratios.html>`_ sprite creation.
 * Support for multi-sprite projects.
 * Create sprites from multiple folders (recursively).
-* Multiple `algorithms <http://glue.readthedocs.org/en/latest/options.html#a-algorithm>`_ available.
-* Automatic `crop of unnecessary transparent borders <http://glue.readthedocs.org/en/latest/quickstart.html#crop-unnecessary-transparent-spaces>`_ around source images.
-* Configurable `paddings and margin per image, sprite or project <http://glue.readthedocs.org/en/latest/paddings.html>`_.
+* Multiple `algorithms <https://glue.readthedocs.io/en/latest/options.html#a-algorithm>`_ available.
+* Automatic `crop of unnecessary transparent borders <https://glue.readthedocs.io/en/latest/quickstart.html#crop-unnecessary-transparent-spaces>`_ around source images.
+* Configurable `paddings and margin per image, sprite or project <https://glue.readthedocs.io/en/latest/options.html#p-padding>`_.
 * Watch option to keep glue running watching for file changes.
 * Project-, Sprite- and Image-level configuration via static config files.
-* Customizable `output <http://glue.readthedocs.org/en/latest/options.html#global-template>`_ using jinja templates.
+* Customizable `output <https://glue.readthedocs.io/en/latest/options.html#global-template>`_ using jinja templates.
 * CSS: Optional .less/.scss output format.
-* CSS: Configurable `cache busting for sprite images <http://glue.readthedocs.org/en/latest/options.html#cachebuster>`_.
-* CSS: Customizable `class names <http://glue.readthedocs.org/en/latest/options.html#separator>`_.
+* CSS: Configurable `cache busting for sprite images <https://glue.readthedocs.io/en/latest/options.html#cachebuster>`_.
+* CSS: Customizable `class names <https://glue.readthedocs.io/en/latest/options.html#separator>`_.
 * Python ``2.6``, ``2.7`` and ``3.3+`` supported.
 * Really `well tested <https://coveralls.io/r/jorgebastida/glue?branch=master>`_.
 
@@ -63,7 +63,7 @@ And also an ``icons.css`` with all the necessary CSS classes for this sprite::
     ...
 
 
-Do you want to know more? Visit the quickstart guide: http://glue.readthedocs.org/en/latest/quickstart.html
+Do you want to know more? Visit the quickstart guide: https://glue.readthedocs.io/en/latest/quickstart.html
 
 Contribute
 -----------

docs/changelog.rst

@@ -53,10 +53,10 @@ Changelog
 * ``--margin`` now supports more than only one margin, you can now use it with (e.g.) ``--margin=10 20 10 20``. Fixes #101
 * New ``setup.py`` fixing #110
 * New options ``--source`` and ``--output`` will now complement the first and second positional argument.
-* New option ``--css-template`` will allow you to choose your own css output `jinja template <http://glue.readthedocs.org/en/latest/templates.html>`_.
+* New option ``--css-template`` will allow you to choose your own css output `jinja template <https://glue.readthedocs.io/en/latest/templates.html>`_.
 * New option ``--scss`` will use ``scss`` as file extension instead of ``css``. Fixing #86
 * New option ``--json-format`` will allow to customize the json structure generated by ``--json``.
-* New feature: Every settting is now configurable using `environment variables <http://glue.readthedocs.org/en/latest/settings.html>`_ and `configuration files <http://glue.readthedocs.org/en/latest/files.html>`_.
+* New feature: Every settting is now configurable using `environment variables <https://glue.readthedocs.io/en/latest/settings.html>`_ and `configuration files <https://glue.readthedocs.io/en/latest/files.html>`_.
 * New option ``--pseudo-class-separator=_``.
 * Glue now support multiple css pseudo-classes applied to the same image #87.
 * Glue css pseudo-class separator is now ``__`` instead of ``_``. If you want to make ``glue`` work in legacy mode use the new option ``--pseudo-class-separator=_``.
@@ -66,7 +66,7 @@ Changelog
 
 * This version includes **several** backward incompatible changes - **read this document carefully before upgrading**.
 
-  - Glue will **not** extract padding information from filenames. If you want to customize paddings individualy (per image), you should use `configuration files <http://glue.readthedocs.org/en/latest/files.html>`_.
+  - Glue will **not** extract padding information from filenames. If you want to customize paddings individualy (per image), you should use `configuration files <https://glue.readthedocs.io/en/latest/files.html>`_.
   - ``--imagemagick`` and ``--imagemagickpath`` are now deprecated. These options were introduced as a workaround in order to solve some scaling glitches caused by ``PIL``. Pillow ``2.2.0`` solves these issues.
   - ``--each-template``, ``--global-template`` and ``--ratio-template`` are now deprecated. CSS output customization can be easily done now using ``--css-template=template.jinja``.
   - ``--ignore-filename-paddings`` is now deprecated. Per-file customization can be easily (and more scalably) done now using configuration files.

docs/files.rst

@@ -40,7 +40,7 @@ If the ``remove.png`` image needs to have ``10px`` margin and ``0px`` padding yo
 This will override any previous setting about ``margin`` or ``padding`` affecting ``remove.png``.
 
 .. note::
-    project-level, sprite-level and image-level settings override any environmnet or command-line settings. More information in the `settings section <http://glue.readthedocs.org/en/latest/settings.html>`_
+    project-level, sprite-level and image-level settings override any environmnet or command-line settings. More information in the `settings section <https://glue.readthedocs.io/en/latest/settings.html>`_
 
 Available configuration
 -----------------------

docs/index.rst

@@ -12,18 +12,18 @@ Glue is a simple command line tool to generate sprites::
   - json (array, hash)
   - CAAT
 
-* Automatic multi-dpi `retina <http://glue.readthedocs.org/en/latest/ratios.html>`_ sprite creation.
+* Automatic multi-dpi `retina <https://glue.readthedocs.io/en/latest/ratios.html>`_ sprite creation.
 * Support for multi-sprite projects.
 * Create sprites from multiple folders (recursively).
-* Multiple `algorithms <http://glue.readthedocs.org/en/latest/options.html#a-algorithm>`_ available.
-* Automatic `crop of unnecessary transparent borders <http://glue.readthedocs.org/en/latest/quickstart.html#crop-unnecessary-transparent-spaces>`_ around source images.
+* Multiple `algorithms <https://glue.readthedocs.io/en/latest/options.html#a-algorithm>`_ available.
+* Automatic `crop of unnecessary transparent borders <https://glue.readthedocs.io/en/latest/quickstart.html#crop-unnecessary-transparent-spaces>`_ around source images.
 * Configurable paddings and margin per image, sprite or project.
 * Watch option to keep glue running watching for file changes.
 * Project-, Sprite- and Image-level configuration via static config files.
-* Customizable `output <http://glue.readthedocs.org/en/latest/templates.html>`_ using jinja templates.
+* Customizable `output <https://glue.readthedocs.io/en/latest/templates.html>`_ using jinja templates.
 * CSS: Optional .less/.scss output format.
-* CSS: Configurable `cache busting for sprite images <http://glue.readthedocs.org/en/latest/options.html#cachebuster>`_.
-* CSS: Customizable `class names <http://glue.readthedocs.org/en/latest/options.html#separator>`_.
+* CSS: Configurable `cache busting for sprite images <https://glue.readthedocs.io/en/latest/options.html#cachebuster>`_.
+* CSS: Customizable `class names <https://glue.readthedocs.io/en/latest/options.html#separator>`_.
 
 Documentation
 -------------