remove Gemfile, Vagrantfile, not used by tk1.0
Revert "Merge pull request #35 from tk0miya/fix-pip-fails-on-changing-prefix_dir"

This reverts commit f0fb2a45ded9c5c255531b54dc0f6838ff811496, reversing
changes made to 4afbc5523b0787e08c63d41b2a1a05b0c554bf62.
add source suite, apt recipe for test-kitchen