Add spin.js-based throbber for all loading

static/partials/repo-admin.html

@@ -1,8 +1,12 @@
-<div class="container" ng-show="!repo || !permissions">
+<div class="loading" ng-show="loading">
+  <div class="spin"></div>
+</div>
+
+<div class="container" ng-show="!loading && (!repo || !permissions)">
   No repository found
 </div>
 
-<div class="container repo repo-admin" ng-show="repo && permissions">
+<div class="container repo repo-admin" ng-show="!loading && repo && permissions">
   <div class="header">
     <a href="{{ '#/repository/' + repo.namespace + '/' + repo.name }}" class="back"><i class="icon-chevron-left"></i></a>
     <h3>
@@ -14,7 +18,7 @@
   <div class="panel panel-default">
     <div class="panel-heading">User Access Permissions</div>
     <div class="panel-body">
-
+        
 	<table class="permissions">
 	  <thead>
 	    <tr>

static/partials/repo-list.html

@@ -1,4 +1,8 @@
-<div class="container">
+<div class="loading" ng-show="loading">
+  <div class="spin"></div>
+</div>
+
+<div class="container" ng-show="!loading">
   <h3>Repositories</h3>
   <div class="repo-listing" ng-repeat="repository in repositories">
     <i class="icon-hdd icon-large"></i>

static/partials/view-repo.html

@@ -1,8 +1,12 @@
-<div class="container" ng-hide="repo">
+<div class="container" ng-show="!loading && !repo">
   No repository found
 </div>
 
-<div class="container repo" ng-show="repo">
+<div class="loading" ng-show="loading">
+  <div class="spin"></div>
+</div>
+
+<div class="container repo" ng-show="!loading && repo">
   <!-- Repo Header -->
   <div class="header">
     <h3>
@@ -81,7 +85,7 @@
 
   <div id="image-history" style="display: none">
     <div ng-hide="imageHistory">
-      Loading images...
+      <div class="spin"></div>
     </div>
 
     <div ng-show="imageHistory">