Merge pull request #53 from Ravenstine/master

Delete members
Remove authorization for playlist#delete in the playlist model. The code used the old is_authorized?, and authorization was already done within the controller.
Add member check to kind_of_entity in authorization model.
Add feedback and information for users without permission to use the features.
Add Clear Playlist button on remotes#show view.
Add ajax and event listener to send a clear request to the server that clears the playlist, then deletes the playlist items from the list on the page.
Add method to clear the entire playlist for the remote.
Merge pull request #65 from nicolejpaz/clear_playlist

Clear playlist