Blog: Add Blog To Bitcoin.org

* Adds new page /en/blog

* Adds new feed for blog posts to /en/rss/blog.xml

* Adds "Blog" link to site footer

* Adds three back-dated blog posts to give the blog some initial
  content.

README.md

@@ -612,3 +612,34 @@ aliases:
   --author=Satoshi Nakamoto: Satoshi Nakamoto
   gavinandresen: Gavin Andresen
 ```
+
+### Blog Posts
+
+Posts for the [Bitcoin.org Site Blog][] should be added to the `_posts`
+directory with the naming convention:
+`YEAR-MONTH-DAY-ARBITRARY_FILE_NAME` (with year, month, and day as
+two-digit numbers).  The YAML front matter should be similar to this:
+
+    ---
+    type: posts
+    layout: post
+    lang: en
+    category: blog
+
+    title: "Quarterly Report March 2015"
+    permalink: /en/posts/quarterly-report-march-2015.html
+    date: 2015-03-05
+    author: >
+      David A. Harding (<a href="mailto:dave@dtrt.org">email</a>, <a
+      href="https://github.com/harding">GitHub</a>,
+      <a href="http://www.reddit.com/user/harda/">Reddit</a>)
+    ---
+
+The type, layout, and category should always be as specified above. The
+other parameters should be set to values specific to that post, but the
+permalink must end in '.html'.
+
+Below the YAML front matter, enter the content of the post in Markdown
+format.  Images should be placed in `img/blog/free` if they are
+MIT-licensed or `img/blog/nonfree` if they have a more restrictive
+copyright license.

_config.yml

@@ -165,7 +165,10 @@ aliases:
 
 safe:        false
 port: 4000
+## Used in older version of Jekyll
 base-url:    /
+## Used in newer versions of Jekyll
+baseurl:    /
 
 source:      .
 destination: ./_site

_contrib/bco-htmlproof

@@ -27,7 +27,7 @@ HTML::Proofer.new(
         ## require updating
         :href_swap => {
           ## (Hack) Append '$' to the ends of filenames we don't want to append .html to
-          /(css|png|rss|pdf|jpg|asc)$/ => '\1$',
+          /(css|png|rss|pdf|jpg|asc|xml)$/ => '\1$',
 
           ## Append .html to end of most URLs so proofer can find the local files
           /^(

_layouts/base.html

@@ -95,6 +95,7 @@
     {% endcase %}
     <a href="/{{ page.lang }}/{% translate press url %}">{% translate menu-press layout %}</a>
     <a href="/{{ page.lang }}/{% translate about-us url %}">{% translate menu-about-us layout %}</a>
+    <a href="/en/blog">Blog</a>
     </div>
     <div class="footersponsor">
       <div><span>{% translate sponsor layout %}</span> <a href="https://bitcoinfoundation.org/"><img src="/img/brand/bitcoinfoundation.png" alt="Bitcoin Foundation"></a></div>

_layouts/post.html

@@ -0,0 +1,25 @@
+---
+# This file is licensed under the MIT License (MIT) available on
+# http://opensource.org/licenses/MIT.
+
+layout: base
+lang: en
+---
+<div class="subhead-links"><a href="/en/blog">Blog home</a>
+| <a href="/en/rss/blog.xml">Subscribe to RSS feed</a>
+| <a href="https://github.com/bitcoin/bitcoin.org/commits/master/{{page.path|uri_escape}}">Post history</a>
+| <a href="https://github.com/bitcoin/bitcoin.org/issues/new?body=Source%20File%3A%20{{page.path|uri_escape}}%0A%0A">Report issue</a></div>
+
+<div class="post">
+  <header class="post-header">
+    <h1 class="post-title">{{ page.title }}</h1>
+  </header>
+
+  <article class="post-content">
+    {{ content }}
+  </article>
+
+  <p class="post-meta">Posted to the <a href="/en/blog">Bitcoin.org Site
+  Blog</a> on {{ page.date | date: "%d %B %Y" }} {% if page.author %} by {{ page.author }}{% endif %}{% if page.meta %} {{ page.meta }}{% endif %}</p>
+
+</div>

_less/screen.less

@@ -941,6 +941,22 @@ br.clear {
 	height: 18px;
 }
 
+div.post {
+        max-width: 40em;
+        margin-right: auto;
+        margin-left: auto;
+}
+.post img {
+        max-width: 100%;
+}
+.post-meta {
+        margin-top: 20px;
+        font-style: italic;
+}
+.post-title {
+        padding-top: 20px;
+}
+
 .highlight  { background: #ffffff; }
 .highlight .c { color: #999988; font-style: italic } /* Comment */
 .highlight .err { color: #a61717; background-color: #e3d2d2 } /* Error */