Use the new build env on Travis

faster vms, more cpu and ram, fast boot times, better network, 2-4-1 coffee at your favourite cafe

docs coming soon
touching .travis.yml for a rebuild
bump horizon to 0.2.0, use signedReleaseProcess, and omit some artifacts from publishing
use new travis container env
Merge pull request #60 from paypal/feature/horizon-0.2.0

Bump Horizon to 0.2.0 and fix a few items related to publishing
Merge pull request #62 from paypal/feature/travis-env

Feature/travis env
Merge branch 'develop' into feature/changelog-stuff

Conflicts:
	project/Build.scala