Merge pull request #733 from bhariharan/unstable

Fixing a minor bug in push notifications
Using callback instead of broadcast for sync status updates
(testing in progress)
Added copyright
Added isRunning method
Merge pull request #734 from wmathurin/unstable

Using callback instead of broadcast for sync status updates
Upgrading to Cordova 3.6.4, which is the latest 3.6.x