Work around bug in dart2js
undo
Working around continue bug in dart2js

BUG=

Review URL: https://chromiumcodereview.appspot.com//14975003
bump version

BUG=

Review URL: https://chromiumcodereview.appspot.com//14689005
Merge branch 'master' of https://github.com/dart-lang/csslib into new_css
Added expansion part of analyzer for nested selectors