Add UI/UX polish in prep for merge

* Bring UI/UX inline with recent changes
* Use select components as a stopgap for credential_types and orgs
* Add tabs to permissions view
* Add Organization model

awx/ui/client/lib/components/panel/_index.less

@@ -21,4 +21,5 @@
 
 .at-Panel-headingTitle {
     .at-mixin-Heading(@at-font-size-3x);
+    text-transform: none;
 }

awx/ui/client/lib/components/panel/heading.partial.html

@@ -6,7 +6,7 @@
     </div>
     <div class="col-xs-2">
         <div class="at-Panel-dismiss">
-            <i class="fa fa-times fa-lg" ng-click="dismiss()"></i>
+            <i class="fa fa-times-circle fa-lg" ng-click="dismiss()"></i>
         </div>
     </div>
 </div>