Merge pull request #51 from eko/master

Add contextual cache to documentation (from PageBundle)
Fix test vendor order
Add support for PRedis, update Symfony2 requirement to 2.2
Fix test autoload
Fix service name
Refactor code
Add counter feature
Tweak .travis file to enable mongodb and memcached
Add valid services to .travis.yml
Add APC to travis
Fix class name
fix deprecated CacheInterface parameter. Using CacheAdapterInterface instead
Updated route name to prevent collision with SonataPageBundle
Merge pull request #52 from rmzamora/CacheAdapterInterface-patch

fix deprecated CacheInterface parameter. Using CacheAdapterInterface ins...
Merge pull request #53 from mremi/fix-doc

Updated route name to prevent collision with SonataPageBundle
refactor code to use the sonata-project/cache library
Fix namespace
Merge branch 'add_cache_lib'

Conflicts:
	Invalidation/DoctrineORMListener.php
[travis] fix composer setup
Fix regression with namespace