Add focus and blur handlers and events to View

Add focus and blur handlers and events to View
Add Text change and return handler/events for text views/areas.

Add Text change and return handler/events for text views/areas.
Animate Android windows opening

http://developer.android.com/reference/android/R.anim.html
http://docs.appcelerator.com/titanium/latest/#!/api/Titanium.UI.Window
R.anim versus just R on Android, window exit/enter negative parameter sets

Bug on getting the correct constant for Android.
Window exit/enter on open(), if a parameter is < 0 then the parameter
is ignored.
More window animation fixes
Exit animation bug fix
Add string width to animation
Merge pull request #31 from mvniekerk/master

Android windows animations, View focus/blur handlers, text change handlers