Carousel: not using transform3d for android devices

Usage of transform3d on android would cause problems for input fields:
- https://coderwall.com/p/d5lmba
- http://static.trygve-lie.com/bugs/android_input/
Carousel: add comment
Carousel: constrain the change to android 2.3 and below
Merge pull request #6 from mobify/carousel-transform3d-on-android

Carousel: not using transform3d for android devices