Added an option to receive initial animation directions

Added option to set the initial animation direction

use it with the animation options:
sintaxe:
animationOptions: { fromDirection: 'VERTICAL, HORIZONTAL' }

for instance: animationOptions: { fromDirection: 'bottom, right' }

options are:

- 'top, left'
- 'bottom, left'
- 'top, right'
- 'bottom, right'
- 'center, right'
- 'center, left'
- 'top, center'
- 'bottom, center'
- 'center, center' or just 'center'

This is regarding issue #38