Fix #87: don't pass mq connection errors to handler
Revert "Fix #87: don't pass mq connection errors to handler"

This reverts commit b69204bca7fce761d61577da7520051a034d49f3.
EXPERIMENTAL: Bump to commons-pool v2.2
New lock-free conn pool cache
Clean up new connection pool docs, opts, bump default max conns (8->16)
Update project.clj template
Bump deps
Update official commands.json spec
Add rspec commands debugger
v2.7.0-SNAPSHOT