Optional logging and expose sendbeacon

Kill logging unless debug: true is specified with the options
Return the sendbeacon method so additional custom events may be triggered by the user leveraging the library:

var analytics = player.ga();
analytics.sendbeacon('MyEvent', true, 'foobar');

Thanks to @jakiestfu for this PR

New Event: srcType

srcType is a new event tracking the engine and the source type being played. Example: html5/mp4

First Version

Alpha version.