Merge pull request #14 from wiggzz/devel

Updates!!!  More capabilities.
added log for 500 internal server errors. (just prints to stdout for now)
Merge branch 'devel' of github.com:storj/downstream-node into devel
added cleanup script that deletes old contracts
unit tests need to be rewritten... they are scrappy.  otherwise, better functionality, and whitelist capability now enabled.