v0.2.0

• add login section, avoid redirecting user to Duoshuo login page
• update routers, move layout.html and all templates to Chill, bump Chill version to 0.2
• add metaShareDirective (disable for now)
• improve workflow, building dependency dist files automatically
• bugfix: fix CodeMirror rendering bug
• bugfix: fix showing signin iconfont before user status updated
• bugfix: remove all bootstrap build-in iconfont, using font-awsome instead