Added Redis server initialization.
Added Cache module and Redis implementation.

Add: CacheInterface that defines basic cach server functionality requirements.
Add: RedisCache - CacheInterface wrapper for Predis library.
Add: NullCache - dummy cache interface in case Redis server is offline!
Add: Cache server initialization in app.php
Added caching of Locale queries.
Added Redis hash get and set functionalities.
Merge branch 'master' of github.com:vexelon-dot-net/e-additives.server