Bug 868460 - Bail earlier when trying to start invalid animators (r=mfinkle)
Bug 868460 - Mark views to have transient state while animating (r=mfinkle)
Bug 868460 - Fix getAlpha() in AnimatorProxy (r=mfinkle)
Bug 868460 - Replace AnimatorProxy calls with ViewHelper ones (r=mfinkle)
Bug 868460 - Move all animation-related classes to the animation directory (r=mfinkle)

--HG--
rename : mobile/android/base/AnimatorProxy.java => mobile/android/base/animation/AnimatorProxy.java
rename : mobile/android/base/HeightChangeAnimation.java => mobile/android/base/animation/HeightChangeAnimation.java
rename : mobile/android/base/PropertyAnimator.java => mobile/android/base/animation/PropertyAnimator.java
rename : mobile/android/base/Rotate3DAnimation.java => mobile/android/base/animation/Rotate3DAnimation.java
rename : mobile/android/base/ViewHelper.java => mobile/android/base/animation/ViewHelper.java