* fixed minor issue with `borderRadius` on legacy browsers
* removed CSS properties from SVG plugin (forgot in previous commit)
* simplified core box model properties and CSS transform tween objects to always use `px` or `deg` as unit, with converted values
* implemented the `crossCheck` function for SVG transforms (for stacking transform chains) and the SVG morph
* simplified the `coords` interpolation used for SVG morph
* general code cleanup
* simplified the `processEasing` since the additional easing plugins have been removed, the old version can be found in the js file for easing examples page
* doc updates
