Added the NativeOS utilities.

Added a CompositeHandler.

Added multibinding to the Jockey interface, should use the
CompositeHandler to make sure that the OnComplete only get invoked once.
Refactored MainActivity with the changes in the library interface
Converted the internal list to a CompositeJockeyHandler.
Merge branch 'master' of https://github.com/paulpdaniels/jockeyjs