Add option to scan/clean the library

[ghost]

Issue #100

[ghost]

This is a very basic implementation, until I get websockets working and receive a notification when the scan/clean has completed and update the web ui appropriately.

[un1versal]

fantastic, though yes seems that the update stuffs websockts isnt working correctly, hence then maybe the movie sets updates arent updating xwmm then, but thats on another issue. ##88 I think.

[ghost]

We don't use websockets at the moment just basic HTTP POST requests which only provide one way communication. We assume that an action has completed, websockest allow us to receive a response from XBMC saying whether or not an action succeeded.

I've got a prototype of the websocket code but it's not usable yet.

[un1versal]

Patiently sitting at the edge of the seat ;) to see the fyfe magic in action