Temporarily remove Anon submitting until GitHub unflags bots as
spammers.
Documenting nginx. Fix #261
Uncomment anon button.
Merge branch 'master' into dev.webcompat.com

* master:
  Uncomment anon button.
  Documenting nginx. Fix #261
  Temporarily remove Anon submitting until GitHub unflags bots as spammers.
Issue: #257, add a /rate_limit route (no real view yet)
Issue #257: add the username to the rate_limit dict.
Simple template for rate limit page.