merge some codes
update tests
add box.styl and base.styl
rename #wrapper
update stylus, remove some useless style, and merge into a file
update template, using new style
move files
update templates
fix bug in dicuss, return lu tpe
move screens stylus files to a folder
some updates
remove form.styl, which is useless. remove two duplicate property
update stylus
Merge branch 'refactoring/stylus' into develop
Merge branch 'develop' of github.com:shonenada/mooc into develop