Setting up internal event hooks to map models to call
clusterMappedEvents

start on clusterMappedOptions

issue #393

@cthrax suggestions done
- last thing to test is actual events firing from the real
  clusterManager work

works but specs broken

specs fixed for cluster mapping on events
issue #392 resolved
Merge branch 'develop' of github.com:nlaplante/angular-google-maps into develop

Conflicts:
	dist/angular-google-maps.min.js