Add docstrings
README fixes

Typo fix (seamless > seemless) and command formatting.
Merge pull request #22 from scraperwiki/minor-readme-fixes

README fixes
Merge pull request #19 from scraperwiki/docs

Add docstrings
Fail early if iptables is broken
Merge pull request #17 from scraperwiki/warn-broken-iptables

Fail early if iptables is broken
Factor dockerConnect() into its own function