Remove useless methods in cache adapters
Add Redis usefull methods
Update & improve Redis class tests
Fix coding styles
Merge pull request #27 from M6Web/feature/add-missing-methods

Fix #9 & improve tests
Merge branch 'master' into feature/use-predis-directly

Conflicts:
	src/M6Web/Bundle/RedisBundle/M6WebCacheExtra/Redis.php
	src/M6Web/Bundle/RedisBundle/M6WebWsClient/Redis.php
	src/M6Web/Bundle/RedisBundle/Tests/Units/Redis/Redis.php
adaptation following the merge