- fix: composing status from slave is now being properly reported
https://github.com/openpeer/op/issues/134
- added delivery state "sent"; core doesn't use but place holder for higher layers.
https://github.com/openpeer/op/issues/136
Merge remote-tracking branch 'origin/feature-20140730-is-composing' into feature-20140521-push-messaging

Conflicts:
	libs/op-core-cpp
- merge is composing