Add a new 'style' crate. (Empty for now.)
Move the content of 'script/style' into the new 'style' crate.
Flat is better than nested.
Add the margin and padding shorthands.
Change the range of percentages to 0..1 in specified and computed values.
Restore the font shorthand, accidentally dropped in commit 622bc5705c
Add CSS parser support for 'vertical-align'.
auto merge of #1059 : SimonSapin/servo/newnewcss, r=kmcallister

Some progress on #1006 and #1057.