 + Better unit minification     4 equal values get compressed to single value (2px 2px 2px 2px => 2px);    two matching pairs will get compressed to one pair (2px 1em 2px 1em => 2px 1em);s    2 equal values get compressed to single value (1cm 1cm => 1cm)    General support for "0" and negative values
 + Better unit minification 
   4 equal values get compressed to single value (2px 2px 2px 2px => 2px);
   two matching pairs will get compressed to one pair (2px 1em 2px 1em => 2px 1em);s
   2 equal values get compressed to single value (1cm 1cm => 1cm)
   General support for "0" and negative values

git-svn-id: f5cda4d11d02f47d80ddd3218d6634f2c5bfc7cd@63 2273e29d-6945-0410-8e99-033b4a520b20

1up-lab/cssmin