EZP-23585: As an editor I want to be able to fill Date field

## Description 

Goal is to be able to fill the date field in the edit part. It is currently working with HTML5 date input which is not supported by every browser (like IE).
Furthermore, currently there is an issue with date values, related to timezone. So the values displayed are wrong ever if the process is good.

## Screenshot

![image](https://cloud.githubusercontent.com/assets/5558766/5283710/8d13ef36-7b0f-11e4-9ce1-2feaa68a69ed.png)

## Link

jira : https://jira.ez.no/browse/EZP-23585
The line to use is now:
```html
<script type="text/javascript" src="../../../Resources/public/vendors/yui3/build/yui/yui.js"></script>
```

(that's why the unit tests are failing on Travis)