0.4.4: Cleanup and extraneous code removal

- Removing "Collection" concept entirely
- Removing "AbstractCollection" class
- Removing "AbstractOptions" class
- Removing "ConsulHttpParamContainerTrait" trait
- Removing "Logger" system, wasn't used and we bubble up errors anyway
- "Request::headers" and "Request::params" are now instances of "Values"
- "Values" closely mimics go's URI.Query property, albeit without any encoding options.