Merge pull request #3 from wangyeming/master

Implement register, sign in and sign out by devise
Merge pull request #5 from wangyeming/master

Password change and email validate have finished
Add weixin model
test to p url
test to p url
test to p url
test to p url
test to p url
test to p url
test to p url
test to p url
test to p url
test to p url
test to p url
test to p url
test to p url
test to p url
test to p url
test to p url
test to p url