Close #177 Renamed and public may need to live off of camera
Merge pull request #219 from excaliburjs/dev-josh

added optional start and end sizes for particles #204
Reorganize directory structure per suggestion in #207
Merge master into directory restructure
Update bower and npm package
Merge pull request #221 from excaliburjs/dev-erik

Merge #207 directory restructure into master
Update CONTRIBUTING.md
Close #100 collision grouping implemented
Closes #218 Added particle startSize and endSize to particle tester
Merge pull request #222 from excaliburjs/dev-erik

Collision grouping and particle demo for start/end size
Closes #215 enterviewport and exitviewport events are implemented
Merge pull request #223 from excaliburjs/dev-erik

Closes #215 enterviewport and exitviewport events are implemented
Closes #224 Implemented OnInitialize and 'initialize'

Also added generic events to Scene, onActivate, onDeactivate, and
onInitialize
Merge pull request #225 from excaliburjs/dev-erik

Closes #224 Implemented OnInitialize and 'initialize'
Fixes #226 actor.kill behaves unexpectedly when called multiple times on the same actor
Merge pull request #227 from excaliburjs/dev-erik

Fixes #226 actor.kill behaves unexpectedly when called multiple times on...
Closes #229 Alias 'on' and 'off' for addEventListener removeEventListener
Closes #228 Double collision event
Attempt to fix build
Fix build