Merge pull request #52 from grosser/helpers

new test helpers
Test via vagrant.
 - Add travis, appraisals, berkshelf
 - use appraisals to test vs chef 10 and 11
 - install current libs on vagrant to test before release
Merge pull request #53 from grosser/vagrant

Make vagrant up work + use appraisal for multi-gemfile test + travis
put mode logic and filename reporting into resource so everybody can benefit