Added new events 'onRendered', 'onOpened' and 'onClosed'

Added three new events.

onRendered - triggered on original select element when selleckt will replace it and binds events, as a parameter sends instance of selleckt which was created 

onOpened -  triggered on original select element when selleckt will be opened, as a parameter sends instance of selleckt which was opened 

onClosed -  triggered on original select element when selleckt will be closed, as a parameter sends instance of selleckt which was closed

test and demo are updated for the demo I'm logging those events for all selleckts to console (if console exist) 
@grahamscott