[WIP] [ClassContent] #63 + add verbose filter to getAction() and getCollectionAction() of ClassContentController

This option is passed as query parameter; it's necessary to lighten get classcontent action response;

The reduction is done by unsetting classcontent entry provided by classcontent definition (like maxentry, minentry, accept and properties)

I did some benchmarks:

- get article collection (26 items) with verbose true: response with over 20k lines
- get article collection (26 items) with verbose false: response with ~9k lines

It still heavy so we have to discuss about this with @crouillon.
This may be more easy but depend on the common usage: do we always need all response or more concise response ?
for example: ``http://your_api_call?param1=foo&verbose
```php
$verbose = $request->query->has('verbose'); //already a boolean
```