Adding a .ruby-version -- 2.1.1

Everyone will need to install / update to ruby 2.1.1 now
Add known issue
Enable scss compression
Enable resources helper
Enable CDN support, clean up site.yml
Add support for copying CDN files
Add expires headers to CDN files
Don't load cabin font from third party
Activate on cdn_http_base, pass this to SASS with a hack
Load resources from cdn
Move various third party scripts to vendor
Add mod_deflates to for any text content on the CDN
Rework feed code

* Use slim templates for html portions
* Remove inline scripts
* Use partials to share code
Remove ignore on vendor
Update Gemfile.lock
Oops, we need nokogiri
Better not delete files from the CDN!
fix EOF
Reset build counters to get rid of my testing attempts :-)
DEVELOPER-303, use // to  avoid causing https problems