Add a few more doc strings.
Doc updates

- Add function documentation to the sandbox_manager
- Improve the Lua circular buffer example
- Document the dashboard configuration variables and fix the default port number
Merge pull request #132 from mozilla-services/doc_updates

Doc updates
Merge branch 'dev' into features/doc-audit
Got rid of most of the `127.0.0.1:port` listener addresses, replaced w/ `:port` to
indicate listening on all interfaces.