Update grunt build to include sample-game
Change solid to fixed, makes more sense
Added extend static method for actors
Reorder Collision enumeration so NONE is falsy
Added special init method to extend
Fix gruntfile so it won't exit successfully when tsc doesn't  compile
Optimize update/draw loop in SceneNode, fix issue with kill method that was modifying the collection during iteration causing actors to miss updates
Merge branch 'master' of github.com:eonarheim/Excalibur into dev-erik
Fix nuget packaging on travis
Merge pull request #99 from eonarheim/dev-erik

Merge Actor.extend, collision fixes, and kill fixes.