Fix1

Use the GroupConcat DQL aggregate function but the "like" operator won't
work until doctrine 2.5 (current = 2.3). If you want to find the "Divina
Commedia" book you have to search "Mickey,Goofy"
Working fix

A little ugly but this work
fix config
delete unless file
Merge pull request #1 from Abhoryo/master

Fix and details