Use the new build env on Travis

more ram and cpu, improved network and boot times

http://docs.travis-ci.com/user/workers/container-based-infrastructure/

more docs coming soon
add querystring to page caching. #2349
add querystring to page caching. #2349
Fixed code style. Update changelog. #2349
Merge pull request #3372 from joshk/patch-1

Use the new build env on Travis
Merge pull request #3384 from ster/develop

issue #2349 : Page caching with querystring
Some polishing following PR #3384