Mutations

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- Ruby 2.1 support added.
- Ruby 1.8.7 support removed.
- Rubinius support updated.
- Gemfile.lock removed (Rails 4 support, etc)
- API change: Add ability to implement a 'validate' method
- discard_invalid option added
- AdditionFilters: Gain ability to pass blocks to filters.

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- Add pluggable filters.
- Add ruby 1.8.7 support [19]
- Add a date filter: date :start_date (/via eliank and geronimo)
- Mutations.cache_constants = false if you want to work in Rails dev mode which redefines constants. [23]

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- Added a duck filter: duck :lengthy, methods: :length to ensure all values respond_to? :length [14]
- Added a file filter: file :data to ensure the data is a File-like object [15]
- Allow raw_inputs to be used as method inside of execute to access the original data passed in. (tomtaylor)
- integer filter now allows the in option. Eg: integer :http_code, in: (200, 404, 401) (/via tomtaylor)
- Added a changelog. [10]

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- Float filter (aq1018)
- Clean up public API + code (blambeau)
- Model filters should lazily resolve their classes so that mocks can be used (edwinv)
- Filtered inputs should be included in the Outcome
- Fix typos (frodsan)

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- Initial versions