[6.0.0] Fixed connection pool issues with connection_pool gem. Remove… …d producer mode and standalone mode with Redis as cache. TA Bucket 1 fix. Impressions single queue. Cache wrapper for async storages.

5.1.2 - Input Validation 

Merge pull request splitio#222 from splitio/development [5.1.1] development into master - Reducing amout of redis calls

Bump up rc version 

Merge pull request splitio#219 from splitio/refactor-configuration Refactor Configuration

Merge pull request splitio#217 from splitio/development Fix Incorrect API key causes unexpected exception

Merge pull request splitio#214 from splitio/incorrect_api_key_causes_… …unexpected_exception Fix incorrect API key causes unexpected exception

Merge pull request splitio#211 from splitio/development Development

Impressions Bulk Size 

Merge pull request splitio#208 from splitio/development Development