Bug 976976 - Update Binary Components rationale to cover existing practice. r=emk.
[fix bug 984499] Update Sandstone Less mixins for CSS gradients
Merge pull request #1794 from gerv/master

Bug 976976 - Update Binary Components rationale to cover existing practice.
Merge pull request #1795 from alexgibson/bug-984499-update-mixins-css-gradients

[fix bug 984499] Update Sandstone Less mixins for CSS gradients