Updating support.v13 to latest version and copying the new PushConstants.java over to platforms.

Conflicts:
	src/android/com/adobe/phonegap/push/GCMIntentService.java

add error handling

Use fallback method for extras.getString: add "gcm.notification." prefix

Raghav/toast capable

Merge branch 'master' of https://github.com/pjalbuquerque/phonegap-plugin-push into pjalbuquerque-master

Conflicts:
	src/android/com/adobe/phonegap/push/GCMIntentService.java

Issue #65: On Android, GCMIntentService.onError() doesn't get passed to the JavaScript 'error' event

[spec] Revamp test
[spec] Fix "[Error: Cannot find module '../www']"
[spec] Add missing 'typeof' to the assetions.
[git] Ignore the node_modules/ directory.
[spec] fix failing tests

usage typo