SyncanoRequest protocol update

Added some docs and new methods for pausing/resuming
Added new methods for paused/failure/success

Added new methods to give user possibility to define two blocks:
success and failure instead of just one ‘callback’.
As well will give user possibility to ask for paused request, so he can
resume it at his will
Updated docs for pausedRequest
Pausing requests updates, failure/success updates

Removed queue methods - they were not used,
Now all requests use paused version, and resume requests inside their
methods if needed, other fixes