Rename README to README.md

This way it can be properly formatted when displayed by GitHub's web
interface.
new tests for regions + multicolumn
Added CSS3 Transforms testcases.
rotateX/Y/Z
transform-style
2 script case
Add test for css3 transforms: rotateY.
Updated the info about testcases.
Merge remote-tracking branch 'upstream/master'
Modified the TCs for CSS Trasnforms.

Fixed the problems.
Modified the help link.
Add test for display: grid.
Add test for display: inline-grid.
Add test for fr unit.
Add test for combined use of fr unit and percentage.
Add tests for properties of css3 grid layout.
remove .DS_Store file
minor change to id name to be consistent with the rest
changed assertion per mihai's feedback
remove width/height per mihai's feedback
change self-describing statement per mihai's suggestion
dropped 'on the left' per mihai's suggestion
fixed spec links per mihai's comments