EZP-23678: Add edit and remove on view section

Link: https://jira.ez.no/browse/EZP-23678

## Description
See issue.

## Screenshot
![sectionview](https://cloud.githubusercontent.com/assets/4035241/5296375/6cd4e3da-7ba3-11e4-9032-1852f0643515.png)


## Test
Manual

## TODO
- [x] Position buttons in the page
- [x] Create a formtype
- [x] Sanity tests
- [x] Update display rules on delete button --> follow up story, depend on kernel future dev.
Do not hesitate to nest a bit:

```php
$this->sectionService->deleteSection( 
    $this->sectionService->loadSection( $sectionId ) 
)
```