Revert "Temporarily stop reporting meta stats"

This reverts commit 80848176234353c7257a643d0f5484e8bde0179b.
Revert "Disable persistent conns for forwarded messages for the moment."

This reverts commit d2e011ee66a3dd39c96ff14f5b3a5211b5ff00b8.
Remove global state

Fixes #31

Will be more confident in this large change after the upcoming test
cleanup (see issue #32).
Fix meta-stats

This change introduces an explicit queue for meta-stats. We
intentionally crash if it fills.

Fixes #33.
Close a listener and connection when done with them
Add a meta-stat count for forwarded messages

Fixes #30.
Remove gocheck for enabled tests
Test refactor

Clean up and re-enable the main suite of end-to-end tests.

Fixes #32.
Dial timeout for establishing TCP connections

Fixes #29.
Meta-count when the server starts

Fixes #34.