Added `--json` options for `hexo list route`
Fixed pagination prev link
Modified class name of list_archives helper
Decide layout when start rendering
Fixed tag cloud. Added `tag_cloud` alias for tag cloud helper. #310
color tag cloud
Tag cloud: Add support for color name
http://www.w3.org/TR/css3-color/#svg-color
Fixed cache
async.forEach -> async.each
Execute callback function after `hexo list route --json` done
2.2.0 release
Merge branch 'dev'