[WIP] EZP-22654: Implement edit and create a section in the admin part of the platformUIBundle

## Description
The goal here was to implement a create's section page and edit's section page in the admin part of the PlatformUIBundle. 

## Issue link 
https://jira.ez.no/browse/EZP-22654

## TODO
- create a new form/type/sectionEdit to improove the code.
- change the way to get the name and identifier ($_POST["ezplatformui_section"]["name"] is not very nice :) ) value from the function editSectionFormAction( $sectionId ) inside the sectionController


## Screenshot

Create a section
![createsection](https://cloud.githubusercontent.com/assets/5558661/3371820/5aee6b92-fba5-11e3-9332-96bda2c6e180.png)

Edit a Section
![editsection](https://cloud.githubusercontent.com/assets/5558661/3371826/66118194-fba5-11e3-83e8-87875bb06eac.png)