Remove unnecessary Thorfile

We don't use Thor for automation
Remove metadata.json

Just confuses things when shipping cookbooks
Drop duplicate task from Rakefile

The integration:vagrant task takes over for this one
Fix typos in Gemfile
Ensure Gemfile.lock is in repo for Travis
Use Supermarket for Berkshelf universe
Travis doesn't cache public cookbooks/builds
Update Travis config from working et_base config

Doesn’t include private Chef Server bits, but should
work without them.