Make sure the  object exists in the notification.

Issue #274: Callbacks for actions buttons

Pimp my readme

Mentioning that the unregister method also cleans up event handlers on the docs.

Fixed a typo in README.md

Now calling .trim() to each array String element when parsing them to Ints/Longs

fix Issue 354

When a vibration pattern is sent as e.g. [0, 150, 250, 100], or a ledColor as e.g. [0, 255, 127, 64], the space after each comma will now be trimmed, which would otherwise cause a NumberFormatException when trying to parseInt/parseLong the string " 0255".

add sound default statement

Added event handler removal

Update README.md

Added detail about requiring no extension as the file name.