re-implement rack-camel_snake
add problems
updated problem description
add some problems and delete formatter
fix problem desc
add and fix some problem desc
fix tests and problem desc
add our slides to useful references
use expect().to instead of should
fix tests
rubocop fix
review desc
temp commit
update oj gem
added desc
Merge branch 'implement-back-rack-camel_snake' of github.com:junsumida/mosscow into implement-back-rack-camel_snake
may have done!!!"
Merge pull request #71 from mixi-inc/implement-back-rack-camel_snake

re-implement rack-camel_snake, fixed #72