Add 1.8.7 support. Thx to @tfausak
Remove required ruby version from gemspec
Add minitest to the test group in bundler
Use the proper travis filename
Try all the rubies
Update changelog
clean up whitespaces
add codeclimate badge
Merge pull request #24 from forresty/codeclimate

Add codeclimate badge
Added date_filter. Note: this isn't a date_time_filter
Added date_filter test-case to hash_filter_spec
date_filter now checks if a date actually exists
Dates can now be used in array as well
Merged dates-filter branch.