In projects with ActiveSupport the invalid dates are not handled correctly.
Merge pull request #29 from eliank/date_filter_fix

In projects with ActiveSupport the invalid dates are not handled correctly
Reconstantize
Update readme
Cherry-picked feature/dynamic_data_types
Model is now a special data-type, like it was before. It has a different constructor.
Name to sym
Making it 1.8.7. Compatible
Merge pull request #32 from bluetools/pull-request/dynamic_data_types

Adding additional filters
Bump version
Class methods names are no longer disallowed, we are defining instance_methods after all.
Merged upstream