Reduction: Remove conn pool

This change removes the connection pool. The idea
is that we don't need a connection pool to deal with
a forking worker. This means that threaded workers are not really
possible now, but that is ok. A forking worker is all that
queue_classic will boast for now.
80 cols
Refactor: move constants into calling modules
Bugfix: should always fork when conccurency is > 1
Merge pull request #175 from ryandotsmith/no-pool-fork-concurr

Reduction: Remove conn pool