Create reactive.js

Usage: 
- reactive.flipType(name, speed, next word);
Flip types:
- flipUpPx
- flipDownPx
- flipRightPx
- flipLeftPx
- flipVerticalUp
- flipVerticalDown
- flipHorizontalLeft
- flipHorizontalRight
Multiple flip
   Example:
reactive.flipUpPx('#demo', 300, 'NOT ANYMORE');
            function second () {
            reactive.flipUpPx('#demo', 300, 'Why not?');
            }
            function third() {
            reactive.flipVerticalUp('#demo', 300, 'Cause it\'s cool');
            }
            window.setTimeout(second, 1500);
            window.setTimeout(third, 2500);