strip spaces from supervisorctl output
fix slowdown probability calc. was incorrectly using kill chance
txn: stabilize the tarjan sorting on the output.

That's both faster and more obviously correct.
txn: simplify txn-queue pulling logic
txn: drop bogus assumption in txn-queue popping.
txn: fix incorrect assumption on PurgeMissing test
txn: fix test so each goroutine gets a different n
Added trivial README.md pointing to labix.org.
MGO-5 - MONGODB-x509 support