Activate HTML5

First work on HTML5 - Login page - Only available in Eldy template (No test with the others templates).

Test realized on Apple Iphone 4 & Ipad mini.

Any help is welcome!

Need feature_level 2 & need enable option in admin->GUISetup  :
![html5button](https://cloud.githubusercontent.com/assets/2341395/5233708/ea1fd936-7797-11e4-994e-c08c133a7e06.png)