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)



Could you explain what we are doing here? It seems like we are adding a new endpoint that accepts connections from conversations if there are any endpoints at all the accept endpoints from conversations, and similarly for channels, but I can't figure out why we would do that?