1. Improved responsive navigation styling when email subscription is present

2. Refactored subscription styling to be more DRY
3. Added an image for email subscriptions
4. Added assets directory to the gitignore for stashing working files
5. Improved gem list in the Gemfile

themes/classic/source/_includes/navigation.html

@@ -1,7 +1,7 @@
-<ul role="subscription">
-  <li><a href="{{ site.subscribe_rss }}" rel="subscribe-rss">RSS</a></li>
-  {% if site.subscribe_emai %}
-    <li><a href="{{ site.subscribe_email }}" rel="subscribe-email">Email</a></li>
+<ul role="subscription" data-subscription="rss{% if site.subscribe_email %} email{% endif %}">
+  <li><a href="{{ site.subscribe_rss }}" rel="subscribe-rss" title="subscribe via RSS">RSS</a></li>
+  {% if site.subscribe_email %}
+    <li><a href="{{ site.subscribe_email }}" rel="subscribe-email" title="subscribe via email">Email</a></li>
   {% endif %}
 </ul>
 <form action="{{ site.simple_search }}" method="get">