add mixin position#123

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oe wants to merge 6 commits intomadebysource:masterfrom

Commits on Jul 18, 2014

add mixin `position`
oe
committed
add position to TOC
Saiya
committed

Commits on Jul 22, 2014

Commits on Jul 23, 2014

fixed bug in number's unit check.
oe
committed

Commits on Sep 1, 2014

fixed style bug by removing appended style "background-clip" in mixins/border-radius/border-radius.js
oe
committed