added drop down indicators in main nav
popover word-breaks at proper locations. added new styles for dt and dd to look some font-size as p; same goes for ul + li. added :hover, :focus style states to li in navbar. TOC underline removed from subnav items. h3 changed to differentiate between h2 and h4. fixed dropdown arrow-tip bug (mobile). mobile navtoggle update.
changed cols layout
Merge branch 'master' of https://github.com/dart-lang/dartlang.org
Merge pull request #279 from dart-lang/upperquad-bug-fixes-2

Upperquad bug fixes 2
Merge pull request #4 from dart-lang/master

12月23号更新