Merge pull request #19 from casivaagustin/master

Changed the whole relations methods, it was all wrong
Merge pull request #20 from casivaagustin/master

More Docs !
Merge pull request #21 from casivaagustin/master

PHPUnit required for dev in composer
Update composer.json
Cache delete fixes and improvements to have prefix in memcache
Merge branch 'master' of git://github.com/42mate/towel