Merge pull request #366 from jonas054/jruby_and_rbx

Add comment explaining a Parser setting that is a workaround.
New formatter FileListFormatter (fixes #357)
Extract Token definition into separated file and move to Rubocop namespace
Generate Token from parser token with Token.from_parser_token
Merge pull request #367 from yujinakayama/refactor-token-handling

Refactor token handling
Add FileListFormatter key `files` to --help text
Work around to the Rubinius' named capture bug

This is a quick fix for this failing build.
https://travis-ci.org/bbatsov/rubocop/jobs/9148060

The issue is already reported but does not seem to be fixed.
https://github.com/rubinius/rubinius/issues/2051
Update RSpec and Rake dependencies
Remove self-check spec and add self-check command to .travis.yml
Merge pull request #370 from yujinakayama/remove-self-check-spec

Remove self-check spec and add self-check command to .travis.yml