added replication API tests
clean up build warnings
clean up build warnings
bug fix: notifications were being sent to deallocated instances of TDReplicationProxy.
use new createPushReplication and createPullReplication method names.
remove observer when proxy is deallocated
refactored TDReplicationProxy to use KVO to detect replication changes and send events back to the JS layer.
added log warning if zombie checking is turned on
added replication test
updated documentation