Added a callback hook for Amplitude Live JS.  This will allow users to update from a server during a live stream where no events are fired.
Added a callback hook for Amplitude Live JS.  This will allow users to update from a server during a live stream where no events are fired.

ericjlubbers/amplitudejs,ushiang/amplitudejs,pcsforeducation/amplitudejs,521dimensions/amplitudejs,pcsforeducation/amplitudejs,ericjlubbers/amplitudejs