Merge pull request yalabot#245 from dbartholomae/master

Fixed that alert is always "closeable" due to change in angularjs 1.4

src/alert/alert.js

@@ -1,7 +1,7 @@
 angular.module("mm.foundation.alert", [])
 
 .controller('AlertController', ['$scope', '$attrs', function ($scope, $attrs) {
-  $scope.closeable = 'close' in $attrs;
+  $scope.closeable = 'close' in $attrs && typeof $attrs.close !== "undefined";
 }])
 
 .directive('alert', function () {