Closes #159 rename flipX, flipY to less confusing names
Implement invert effect
Merge pull request #165 from eonarheim/dev-kamran

[Closes #160] Add Touch event support
Closes #162 Multi track sound support for IE11
Merge pull request #167 from eonarheim/dev-erik

Merge multitrack sound support, invert effect, and flipX, flipY rename
Update README.md
Related to #168 Updated scene transitions, still need to hook up to event dispatcher
Merge pull request #173 from eonarheim/dev-erik

Related to #168 Updated scene transitions, still need to hook up to even...
Change onActivate and onDeactivate to be methods not properties
Merge pull request #174 from eonarheim/dev-erik

Change onActivate and onDeactivate to be methods not properties
Make engine public off of scene, root scene needs reference to engine
Merge branch 'master' of github.com:eonarheim/Excalibur
Fix build error