Add gems to use memcache on Heroku
Configure production, staging environments to use memcachier
Add memcachier gem
Merge branch 'heroku_caching' into develop
Configure staging to use Cloudfront CDN
Merge branch 'cloudfront' into develop
Add Google Analytics tracking
Add basic cohort tracking info to Google Analytics
Merge branch 'google_analytics' into develop
Add asset_sync gem
Merge branch 'cloudfront' into develop