Enhancement - Ability to play via url

[jphphotography]

If the url is known it would be nice to be able to skip the search and play directly, this might also allow for easier integration with possible future front ends.

Additionally the ability to save url's and build a playlist would also be nice, however a previous bug mentions the ability to provide log in credtials which I assume would give access to liked playlists already.

[dbrgn]

Fixed by #23.

You're right, I don't want to keep separate favorite lists on the page and on the local machine. Access to favorites will be added some time in the future.