Merge branch 'master', remote branch 'origin/master'
Merge branches 'modeling-users' and 'master' into modeling-users
add test for user
summarize static page test
change description for user validation
set test for presence and length range
set validation for user name length range
add email format validation
set case sensitive false to user model
set test for user authentication
Merge pull request #12 from incheon/modeling-users

Modeling users