start new branch
change menu place
layout renewed
another layout update
layout banner update
body padding-top 120px->70px
pull
Merge branch 'newFlatCss' of github.com:joshua5201/tioj into models_and_controllers

Conflicts:
	app/views/layouts/application.html.erb
pull
get application.html.erb from newFlatCss
fix tiny bugs about the link
add new_columns_to_problems
pull
Merge branch 'models_and_controllers' of https://github.com/joshua5201/tioj into newFlatCss

Conflicts:
	app/views/layouts/application.html.erb
problem->show update
add Markdown support
finish main part of problem show
update form
show.erb update
pull show.html.erb