Point staging to the apt cache branch.
Bump travis-build.

Includes a fix for a quote sign that snuck in unseen.
Bump travis-build.

Includes fixes for apt and npm.
Bump travis-build.
Include host names in config for the build.
It's hosts, not host_names.
Bump travis-build.
Bump travis-build back to master.
Bump travis-build.

Includes a little echo to show that we're setting up the APT cache.
Merge branch 'staging'

Conflicts:
	Gemfile.lock