[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.
Ok,

so maybe instead of force people to set verbose to false can we pass a ``concise`` parameter ?

So: 
* no ``concise`` query parameter in url => "verbose output" which is the default wanted behavior
* ``concise`` query parameter in url => a more concise output is returned

Finaly I try to remove boolean casting from process, but if API is already locked, I'm ok with that :+1: 
So you will limit your tests and don't need anymore a default value