Merge pull request #13 from wiggzz/devel

Further unit tests, and better http response codes.
node status now lists all stats for a list request.
Merge branch 'devel' of github.com:storj/downstream-node into devel
PEP8
reorganized sql significantly to improve online/offline flutter and uptime.
modified route to include answered state of challenge.
added ip address change capability in verify_proof. a few other modifications.
PEP8
bump version