Fixes #8, finally
Updates item selection in activatePanel method. Long due.
Adds enabling, disabling and toggling of the plugin, closes #13.
Prevents snapping to weird positions when enabling after a while of disabling.
Updates docs on  callback.
Adds documentation on events.
Bumps version to v0.10.0
Better explanation on attaching a menu.
Allows loading of demo page from file:// protocol.