Recognize some Ruby files related with Chef: Berksfile, Cheffile, Vaganbondfile

* Berksfile: http://berkshelf.com/#the-berksfile
* Cheffile: https://github.com/applicationsonline/librarian-chef#the-cheffile
* Vaganbondfile: https://github.com/chrisroberts/vagabond#how-does-it-work
AllCops:Include are excluded from Style/FileName by default, remove them from default.yml.

Related with commit c2b3fb5e.
Merge pull request #1366 from onddo/recognize-some-chef-files

Recognize some Ruby files related with Chef: Berksfile, Cheffile, ...