fixes for DEVELOPER-404 and DEVELOPER-478

Buzz page fixes for DEVELOPER-404 and DEVELOPER-478

removed icons on get involved page
Fixes DEVELOPER-438 (indicate more quickstarts)
Fixed two small errors in the yaml files
Fixes DEVELOPER-441 (jbds download link)
Fixes DEVELOPER-456 (typo)
DEVELOPER-485 Add Java EE 7/WildFly videos to developer-materials
DEVELOPER-484 Change "Added" to "Authored"
DEVELOPER-484 Switched to 'published' for concistency
Fixes DEVELOPER-483 (versions on amq)

When you add a new version, you need to match the current version with
the just added version.
DEVELOPER-483 (versions on datavirt & fuse)
Mobile filtering  - fixes DEVELOPER-367
Improvements to books page for DEVELOPER-482
Fixes DEVELOPER-477 (zip -> jar)

Paul, please check to see what is in the download manager. It appears to
be .zip. If it is .zip, do we need to rename it or keep things how they
are currently?
Updated Gemfile.lock
Updated cdn.yml
Add Technology page videos
Updated configuration for Travis CI.
Update cdn.yml
cover images for unavailable books
Add Travis Build Status