Update gemspec to include connection_pool gem
WIP Pooling API, this requires configuration API to keep this simple
Named connection pool support added, using the connection_pool gem.

Connection pools must be created on the config prior to use. They must has a symbol associated with them, and they will return a connection as the first arguement to the called command.
Add tests for connection pool support
Update README.md with connection_pool support docs
Merge pull request #5 from dinedal/feature/connection_pooling

Feature/connection pooling