Bump Chef to 11.18.0.rc.0, ChefDK to 0.3.5
Bump Berks to 3.2.1 to fix file sync issue
Merge pull request #294 from opscode/rel-chefdk-035

Bump Chef to 11.18.0.rc.0, ChefDK to 0.3.5
Chef 11.18.0.rc.0 had a borked test, bump to rc.1
Add batch cleanup code for windows
Support rubygems 2.x