Lazy loading : Add new animation : Fade-Scale + Add colors to grids elements

Add new animation base on opacity and scale.
Add colors to grid elements for better animation preview.
![capture decran 2013-12-29 a 22 15 59](https://f.cloud.github.com/assets/1975398/1820081/91f75d7c-70ce-11e3-9cbd-77884d95101e.png)
![capture decran 2013-12-29 a 22 16 02](https://f.cloud.github.com/assets/1975398/1820082/9b04d1a6-70ce-11e3-8cfd-1c612c9d7ba3.png)
![capture decran 2013-12-29 a 22 17 29](https://f.cloud.github.com/assets/1975398/1820083/a49f089e-70ce-11e3-89b1-24827ef7c65c.png)