Add clear and addStaticURL methods to the AjaxMockups and use it
Add tests for the addAttribute method (update context operation with action = APPEND)
isPatter => isPattern
parse_discover_availability_response => parse_discover_context_availability_response
Initial implementation of the {create,update,cancel}AvailabilitySubscription methods
Remove unused variables
Improve {create,update,cancel}Subscription methods
Add Initial tests for the {create,update,cancel}subscription operations