Add edit icon to action toolbar

The action toolbar should include an 'edit' icon.

Clicking on the edit button enables the user to change the original values they inputted when creating the item.

![screen shot 2014-09-18 at 1 44 31 pm](https://cloud.githubusercontent.com/assets/1521387/4319236/b6042fd6-3f29-11e4-9835-b19d52ea5b4d.png)



@justinvdm The idea here was to reuse the same modal for adding/editing, so if we have a component we are editing else we are adding a new one. There are only 2 checks... 1 in the modal controller and the other in the result callback. Do you have an idea in mind how to make this a bit more readable?