validations of M
add contact page and test
Make User model
fix chapter
Merge pull request #34 from idanyzheng/master

daily PR
init demo-app
add micorpost
Finish demo app
initial commit for sample_app
Add a full title helper
Merge pull request #37 from chankaward/master

finish chapter 4
Merge pull request #35 from kaku87/master

第三章也搞定了
Merge pull request #36 from xiongbo/master

第一、二章
added debuginfor,FactoryGirl,Gravatar
Finish chapter4
Merge branch 'master' of https://github.com/bay6/prepare
add microposts
finish chapter2
start chapter3
Improve the README