dashboard textbox edit close fix

addresses issue Madalin found that allows a click off the dialog box to
close it without resetting the textbox

getredash#54

client/app/pages/dashboards/widget.js

@@ -40,6 +40,8 @@ function DashboardWidgetCtrl($location, $uibModal, $window, Events, currentUser)
       resolve: {
         widget: this.widget,
       },
+      backdrop: 'static',
+      keyboard: false,
     });
   };