Upgrade Bootstrap and Bootswatch to v3.4.1 (ryan-roemer#190)

Solar theme is unfortunately removed as it was never officially released with
v3.4.1 and instead came out only with Bootswatch v3.3.7 and v4.x.

HISTORY.rst

@@ -2,6 +2,12 @@
  History
 =========
 
+==========
+UNRELEASED
+==========
+* Upgrade Bootstrap and Bootswatch to v3.4.1. (`@vedranmiletic`_)
+  `#190 <https://github.com/ryan-roemer/sphinx-bootstrap-theme/issues/190>`_.
+
 ======
 v0.7.1
 ======
@@ -364,5 +370,6 @@ v0.0.1
 .. _@tristanlins: https://github.com/tristanlins
 .. _@troeger: https://github.com/troeger
 .. _@vkoby: https://github.com/vkoby
+.. _@vedranmiletic: https://github.com/vedranmiletic
 .. _@zyga: https://github.com/zyga
 

sphinx_bootstrap_theme/bootstrap/layout.html

@@ -1,7 +1,7 @@
 {% extends "basic/layout.html" %}
 
 {% if theme_bootstrap_version == "3" %}
-  {% set bootstrap_version, navbar_version = "3.3.7", "" %}
+  {% set bootstrap_version, navbar_version = "3.4.1", "" %}
   {% set bs_span_prefix = "col-md-" %}
 {% else %}
   {% set bootstrap_version, navbar_version = "2.3.2", "-2" %}