And sprockets 3 also caches files in tmp/cache/assets/sprockets

This reverts commit 5fcc239d.

closes #7084

the whole build is faster, if the workers start first with the longer
running jobs.

since Travis' wget has no clue what SNI is
who needs security anyway, right?

the Amazon S3 connection at Travis seems to be a bit flaky...

encrypting the channel setting

Courtesy of https://github.com/mozilla/build-tools/commit/c13a297

commit_message has newlines which break the rather naive
IRC client Travis uses

See the changes to the changelog for more details

As per https://www.loomio.org/d/VuwvXWU7/ruby-versions?proposal=DM8zidhc

faster better stronger

Travis build environment was updated to FF 31

https://www.loomio.org/discussions/10519?proposal=6611