Datetimepicker integration

Integrate dateTime picker ( need core v2.15 ) on browser that do not support dateTime input types 
( firefox for example ) and let browser that supports it manage it themselves.

![debeugage_3 2014-05-12 17-19-43](https://cloud.githubusercontent.com/assets/3479942/2946155/e89d663e-d9e8-11e3-9db7-97903ad1be5e.png)