- Fix namespace drop down to save the namespace last selected (and validate)

- Add a "can_create_repo" entry to the organization and have orgs grayed out in the new repo view if the user cannot create a repo
- Fix the multiple-orgs bug in the model
- Have the "create new repository" button disappear on landing if the org is selected and the user does not have create permissions for that org

static/partials/new-repo.html

@@ -29,7 +29,7 @@
       <div class="section">
         <div class="new-header">
           <span style="color: #444;">
-            <span class="namespace-selector" user="user" namespace="repo.namespace"></span>
+            <span class="namespace-selector" user="user" namespace="repo.namespace" require-create="true"></span>
             <span style="color: #ccc">/</span>
             <span class="name-container">
               <input id="repoName" name="repoName" type="text" class="form-control" placeholder="Repository Name" ng-model="repo.name" required autofocus data-trigger="manual" data-content="{{ createError }}" data-placement="right">