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.
New cop Metrics/AbcSize

Measures the Assignment Branch Condition metric defined by
http://c2.com/cgi/wiki?AbcMetric
Merge pull request #1370 from jonas054/abc_metric_cop

New cop Metrics/AbcSize
Merge pull request #1366 from onddo/recognize-some-chef-files

Recognize some Ruby files related with Chef: Berksfile, Cheffile, ...
[Fix #1352] WordArray accepts special characters

Instead of whitelisting all word characters, it should be enough to
just blacklist all space characters and parentheses.
Make code pass WordArray inspection