Pathspec

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- `Pull 3`_: Fixed trailing slash in gitignore patterns.
- `Pull 4`_: Fixed test for trailing slash in gitignore patterns.
- Added registered patterns.

.. _`Pull 3`: https://github.com/cpburnz/python-pathspec/pull/3
.. _`Pull 4`: https://github.com/cpburnz/python-pathspec/pull/4

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- Fixed setup.py.

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- Added tests.
- Fixed comment gitignore patterns.
- Fixed relative path gitignore patterns.

- (Feature) A CLI tool, pathspec-rb, is now provided with the gem.
- (API Change) New namespace for gem: `PathSpec`: Everything is now namespaced under `PathSpec`, to prevent naming collisions with other libraries. Thanks tenderlove!
- (License) License version updated to Apache 2. Thanks kytrinyx!
- (Maint) Pruned Supported Ruby Versions. We now test: 2.2.9, 2.3.6 and 2.4.3.
- (Maint) Ruby 2.5.0 testing is blocked on Travis, but should work locally. Thanks SumLare!
- (Maint) Added Rubocop and made some corrections

- Fix for regexp matching Thanks incase! 16
- File handling cleanup Thanks martinandert! 13
- `from_filename` actually works now! Thanks martinandert! 12

- Port new edgecase handling from [python-path-specification](https://github.com/cpburnz/python-path-specification/pull/8). Many thanks to jdpace! :)
- Removed EOL Ruby support
- Added current Ruby stable to Travis testing