[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.
we expect verbose to be setted at true by default. If you want to get lighweight data of your classcontent, you have to provide verbose parameter setted at false. But has('verbose') will return true.