Provide a command line interface for updating deps
Stop testing on Node 0.8

Check npm/npm#6246 to see if there is a workaround.
Look for config file in install path and cwd

In the case of a global install (not recommended) the config file may be in the cwd (or parent) rather than the install path.
Merge pull request #38 from tschaub/cli

Provide a command line interface for updating deps.