Merge pull request #26 from GoIntegro/feature/custom-filters

[ISSUE-25] Adding custom filters
Update README.md
Adding caching configuration.
Adding configuration options for the Redis and Memcached caches.
Adding some more configuration options for caching.
Misplaced something.
Now it works. The config structure was not properly described.
The Redis and Memcached params are now configurable.
Update README.md
Update README.md
Removing a useless dependency.