Add markdown support for description.
Add markdown support for description.

blackshow/hexo-theme-freemind.386,leesei/hexo-theme-freemind,wzpan/hexo-theme-freemind,chenzaichun/hexo-theme-freemind,leesei/hexo-theme-freemind,wzpan/hexo-theme-freemind,oomusou/hexo-theme-openmind,JoshuaZe/freemind,yieme/hexo-theme-freewill,zhi1ong/hexo-theme-freemind