Revert "Reimplemented Css specification"

This reverts commit 0deb0232ebf6c0d123c25aa0318c3dacc59de727.
Rereimplemented Css specification
Added z-index checking to specs of PageAnimation
Improved the name of the specs
Changed page effect specification

Changed page effect selector policy.  Before commit, the class name is
used to select as previous-page and next-page.  The selector is now
replaced by nth-of-type() selector, which is supported since CSS3.
Merge branch 'dev'