Code cleanup part #1: move all the services and directive JS code in the app.js file into its own files

static/js/directives/ui/repo-breadcrumb.js

@@ -0,0 +1,22 @@
+/**
+ * An element which shows the breadcrumbs for a repository, including subsections such as an
+ * an image or a generic subsection.
+ */
+angular.module('quay').directive('repoBreadcrumb', function () {
+  var directiveDefinitionObject = {
+    priority: 0,
+    templateUrl: '/static/directives/repo-breadcrumb.html',
+    replace: false,
+    transclude: false,
+    restrict: 'C',
+    scope: {
+      'repo': '=repo',
+      'image': '=image',
+      'subsection': '=subsection',
+      'subsectionIcon': '=subsectionIcon'
+    },
+    controller: function($scope, $element) {
+    }
+  };
+  return directiveDefinitionObject;
+});