* Set config.cache_store in application.rb

* Set config.cache_store in environments.

* fix code format.

Resolves #2780

* add redis-namespace gem

* namespace redis usage

* refactor redis namespace code to be less intrusive

previously : would be prepended to keys when the
REDIS_NAMESPACE env var was not set

now if it is not set the namespacing functions are
not used at all, which should prevent disruptions
when instances update.

* fix redis namespace variable style in streaming js

* remove trailing space

* final redis namespace style fix

connection options instead of setting REDIS_HOST etc individually

Close #1986

to be more readable, add extra logging to process feed service