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

static/js/directives/file-present.js

@@ -0,0 +1,18 @@
+/**
+ * Sets the 'filePresent' value on the scope if a file on the marked <input type="file"> exists.
+ */
+angular.module('quay').directive("filePresent", [function () {
+  return {
+    restrict: 'A',
+    scope: {
+      'filePresent': "="
+    },
+    link: function (scope, element, attributes) {
+      element.bind("change", function (changeEvent) {
+        scope.$apply(function() {
+          scope.filePresent = changeEvent.target.files.length > 0;
+        });
+      });
+    }
+  }
+}]);