added debuginfor,FactoryGirl,Gravatar
added signup form
signup is ok
Finsh chapter7
add page(About Us) exercise
finish bootstrap layouts
Finish chapter 5
Merge pull request #38 from chankaward/master

Finish Chapter 5
Add a StaticPages controller
add home and help page
Finsh sign in
Merge pull request #39 from idanyzheng/master

迟到的pr
Update README.markdown
Finish static pages
update with slim template
Merge pull request #41 from xiongbo/master

Finished chapter 3
Starting chapter 5
Modified .gitignore, ignore .swp files to commit in
Add rails.png
Modified custom.css.scss, and more layout files