HOTFIX MIE-1423. Preventing Uncaught Exceptions from Redis.

When a request comes to AS and redis is not responding, proceed without cache.

This PR is intended to create a fallback for when redis is out of service. Hopefully now we are enable to wait for redis for a come back. Meanwhile AS keeps working without cache. Then once Redis is back, AS returns to cache service.

*We still waiting for a low level fix coming from sails issue.

#### Known issues: 
  On getting several events from redis "connected" / "disconnected", an internal problem with Sails occurs. Its controller request returns:  **Unable to parse HTTP body :: 'Redis connection gone from close event.'**
it would be better to not do that here.. but rather do this in project-activitystreams and also sails.log out the errors that happen...