Fixes DEVELOPER-748

I think, anyway. Local testing is inconclusive.

Adding DCP changes and using it in the javascript

I completely forgot about this (the dcp part). We need this added to the
environments to make use of this.

Adding the sandbox quickstarts to be experimental too.

Removing include_in_all
fixing dev mat reload on keyup events. Fixes DEVELOPER-862
Update blinkr 0.2.1
DEVELOPER-873 Switch the homepage hero to advertise the JUDCon:Boston Wrapup
DEVELOPER-858 Add Google Tag Manager code to all pages
Updated Gemfile.lock
Merge pull request #436 from paulrobinson/DEVELOPER-873

Developer 873
Merge pull request #433 from wesbos/DEVELOPER-862

fixing dev mat reload on keyup events. Fixes DEVELOPER-862
Update cdn.yml
Update cdn.yml
Merge pull request #435 from pmuir/blinkr_0.2.1

Update blinkr 0.2.1
Fixes DEVELOPER-875

Update to the latest blinkr as well
Fixes DEVELOPER-853
Merge pull request #438 from LightGuard/DEVELOPER-875

Fixes DEVELOPER-875
Merge pull request #425 from paulrobinson/DEVELOPER-858

DEVELOPER-858 Add Google Tag Manager code to all pages
Merge pull request #439 from LightGuard/DEVELOPER-853

Fixes DEVELOPER-853
Update cdn.yml
Update to blinkr 0.2.2
Merge pull request #437 from pmuir/blinkr_0_2_2

Update to blinkr 0.2.2
Update cdn.yml