adding two different gradient mixins. may and more later as needed.
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Merge pull request #535 from twbs/gradient-mixins

Gradient mixins
add backface visibiliy hidden to bars
Merge pull request #536 from twbs/headers

Make sure bars in modals don't disappear
adjusting inputs on android
run grunt
Merge pull request #537 from twbs/and-forms

Adjusting the form inputs and input-rows in the android theme
Add Autoprefixer support.
Refactor Gruntfile.js targets.
Run `grunt`.