1. Added "position.top" and "position.left" attributes to allow users specify which portion of the photos to be shown.
2. Added "before" callback.
3. Renamed "eachcomplete" callback to "after".
4. Renamed "allcomplete" callback to "complete".
5. Simplified and fixed "percentOrPixel()" method.
6. Changed all "parseInt()" to "parseFloat()" to get more accurate values.
7. Replace 'px' from all atributes during plugin initialzation.
Merge pull request #2 from pakcheong/positioning

Merge positioning branch to master