Added tint() and shade() color helpers,  including documentaiton and tests
Added CSS3 filter() mixin
Adjusting the multi-column mixins to match the spec for column-rule-color, column-rule-style, and column-rule-width (the implementation was missing the critical "column-" prefix).
Replace Heroku add-ons site with Heroku status
Merge pull request #939 from mschoening/stable

Replace Heroku add-ons site with Heroku status
Revert "Merge pull request #866 from kwliou/stable"

This reverts commit f562f4855d1e290ac70605063f096a473af4bb5c, reversing
changes made to 237853a94489534e9902272808bc588b74c65ed0.

This merge broke the code and once fixing that, the tests didn't pass.
Merge remote-tracking branch 'parkr/stable' into stable-filters
Disable the -ms and -o prefixes for the filter property.
tests for the css3 filter property.
Remove the default filter and assocated warning.
Merge pull request #917 from jhilden/4928fe17fc99367d87e0c7503f34f756c536d7e6

Added tint() and shade() color helpers
Merge remote-tracking branch 'easy-designs/stable' into stable
update tests for column-rule mixin change.
Remove -ms prefixes for transitions.

Addresses #924.
Remove the -ms prefix from gradients.

Addresses #924.
Changelog entry for -ms prefixes on gradients and transforms.
Version 0.12.2
Use the right directory for cleanup when generated_images_dir is set.

Closes #931.
removed old growl_notify dependency test should now run on linux!
Added import to _user-interface.scss in _css3.scss