Add ability to manually rate a tv show.

Add ability to manually rate a tv show.
Add supporting calls to traktapi class.
Add ability to show notification that a show/episode/movie has already been rated.
Clear properties used when calling manual functions, as to not re-trigger them if service crashes before clearing properties.
Add method isShow, and getShowDetailsFromXBMC
Alter check for status/error fields in traktRequest, since show summary has a status field which is not success/failure, this caused an error.