Merge pull request #214 from excaliburjs/dev-josh

added opacity to actors
Close #195 Loading bar actually works
Close #198 Logger is available on all actors, added clearAppenders method
Merge pull request #216 from excaliburjs/dev-josh

Added 'fade' action to Actors
Merge pull request #217 from excaliburjs/dev-erik

Merge #195 and #198