First draft of fabfile
Initial hookshot.js draft
Update fabfile comments
Nginx config for GitHub webhook, reverse proxy

The reverse proxy triggers hookshot.js, launched by `fab start`.
Further expand fabfile comments
Push documentation from fabfile.py to README.md
Merge branch 'master' of github.com:18F/hub into staging-public
Fix Node binary download link; add Node downloads
Clarify [BRANCH] example placeholder
Add GitHub Webhooks information
Fix typo and tweak part of "Preparing..." intro
Merge branch 'master' of github.com:18F/hub into staging-public
Merge pull request #18 from 18F/staging-public

Initial preparations for automated deployment