Add Selectable Paginator

Add count

Hack

Change count

As Selectable always load a whole collection to do a count, we just
return 0. It's up to the developer, if he/she needs the complete count,
to use a repostiroy for that

Bring back
Add tests
Fix PHP 5.3 tests
Fix tests
Add doc for Selectable adapter
FQCN for covers

Otherwise it's not recognized by PhpStorm