Initial Commit and import.

Include opacity, rotate, rotateX and rotateY.
Add scale mixins.
Add skew mixins.
Add translate mixins.
Add translate3d mixins.
Rename demo files.
Add Toggle Everything button.
Add perspective mixins.
Add perspective-origin and transform-origin mixins.
Add animation mixins.
Merge remote-tracking branch 'origin/master'
Docs and copy-write headings in prep for open sourcing.