switch production to `www.streetmix.net` #466
Log events for opening dialog box or help menu
Remove about-beta page (now archived at github.com/streetmix/about-beta)
Remove unused doc images and move these images from public/ to doc/
Street should have its creator_id set before validation
User factory: Twitter ID can't contain periods; max 15 characters
adding some more unit and feature tests
use Mailcatcher for local development; also moving foreman and mailcatcher out of Gemfile

(so that their dependencies don't conflict with those of other libraries)
Merge branch 'master' into rails

Conflicts:
	app.js
	app/views/index.ejs
	config/production.js
README.md can reference images using relative paths
Merge branch 'master' into rails
Sendgrid no longer needed for local testing

because of changes in commit 8208927