Merge pull request #1 from chrisjshull/patch-1

Provide clearly written out license.
treat transition-property like transition for value prefixing

The code used to check for the css property 'transition' for css values
to prefix. 'transition' however is a shorthand of several properties
(including 'transition-property'). This change just makes 'transition-
property' follow the same logic as 'transition' for css values to
prefix.
Merge pull request #118 from chrisjshull/master

treat transition-property like transition for value prefixing
Made at2x require a hi-res tag in the value to activate (as per Styl Discussion)
Switched keyword from hi-res to at-2x for at2x
Updated Documentation for at2x
Merge pull request #121 from rschmukler/at2x

Made at2x require a hi-res tag in the value to activate
fix part docs of .mixin() in .function() section
Merge pull request #122 from bolasblack/fix-mixin-document

fix part docs of .mixin() in .function() section