add favicon, logo wordmark. close #12
Merge pull request #210 from saberma/saberma-enhancement/12-add-logo

加入 Favicon 和 文字 Logo
show user profile. close #150
Merge pull request #212 from saberma/saberma-feature/150-show-user-profile

用户首页显示更多信息
use coffeescript. close #201
Merge branch 'master' of github.com:saberma/19wu
Fix user login validate
Merge pull request #214 from yesmeck/fix-user-validate

修正用户登录名的格式验证错误
add swp and DS_store to gitignore
add gravatar_for to users_helper
add gravatar to signed_in navbar
adjust the gravatar's position in the navbar
add gravatar to show page of user
add test for gravatar_for helper
add gravtastic gem
use the gravtastic to show user's gravatar
delete the users_helper file and the spec test
add compound datetime responsive width. close #188
adjust user profile css. close #211
add registration form in the new_user_session view