Merge pull request #14 from densone/master

added data to gitignore.
add metrics support - graphit, stathat, commandline
updated readme
Merge pull request #17 from bketelsen/master

add metrics support - graphit, stathat, commandline
implemented simple shared secret authentication using the http
authentication header.

- Added flag for -secret. If -secret is an empty string (default), the
  skydns server does not require authorization.