Use PKTAsyncTask instead of task handle/descriptor
Fixed broken tests after PKTAsyncTask migration
Remove keyPath relation for isCancelled
Added merging ability PKTAsyncTask
Remove completion handlers from all async methods
Added missing forward declaration
Use dispatch once for resolving tasks
Support piping of async tasks
Use PKTAsyncTask to save item
Use lower case for keys in item fetch result
Renamed combinator methods and added onComplete:
Only store callbacks if not completed
Fix bug where self.result was used
Use onComplete for authentication callback
Added assign/complete/incomplete to task API area
Removed version of CocoaPods from Gemfile
Update Gemfile.lock
Use stdlib getoptlong instead of getopt gem
Merge pull request #8 from podio/asynctask

Use PKTAsyncTask for managing callbacks and cancellations