shorter queue test (reloaded)
rewrite FindProvidersAsync
changes from PR
Merge pull request #440 from jbenet/findprovs-rewrite

rewrite FindProvidersAsync
remove multilayered routing table from the DHT (for now)
Merge pull request #441 from jbenet/rtable-simplify

remove multilayered routing table from the DHT (for now)
update msgio (combine)
util/log: SetDebugLogging
crypto/key: stretcher refactor
msgio proper write
secio -- spipe v2

This commit introduces secio, the next generation spipe.
seccat (to test sio)