Treat about partial as a static asset

Now bundling all partials into `templates.js`. This didn't work so well
for the about partial because the cowsay <pre> tag got all messed up
when it was pre-cached in JavaScript. Moving this to assets to show that
it's not meant to be bundled, but downloaded as an ajax request instead.

awx/ui/client/assets/cowsay-about.html

@@ -0,0 +1,28 @@
+
+<div id="about-dialog-body">
+    <div class="row">
+        <div class="col-xs-12 col-sm-5">
+            <div style="width: 340px; margin: 0 auto;">
+<pre id="cowsay">
+ ________________
+/  Tower Version \
+\<span id='about-modal-version'></span>/
+ ----------------
+        \   ^__^
+         \  (oo)\_______
+            (__)\     A)\/\
+                ||----w |
+                ||     ||
+</pre>
+            </div>
+        </div>
+        <div  class="col-xs-12 col-sm-7 text-center">
+            <img id="about-modal-titlelogo" src="/static/assets/ansible_tower_logo_minimalc.png"><br>
+            <p>Copyright 2015.  All rights reserved.</p>
+            <p>Ansible and Ansible Tower are registered trademarks of Ansible, Inc.</p>
+            <br>
+            <p>Visit <a href="http://www.ansible.com" target="_blank">Ansible.com</a> for more information.</p>
+            <br>
+            <p><span id='about-modal-subscription'></span></p>
+    </div>
+</div>