create static_page
Merge pull request #1 from nguyenhoa/layout

Layout
signin/signout
Merge pull request #2 from nguyenhoa/signin/signout

Signin/signout
namespace admin
Merge pull request #3 from nguyenhoa/namespace_admin

Namespace admin
Merge pull request #3 from nguyenhoa/namespace_admin

Namespace admin
Merge pull request #4 from nguyenhoa/subject

Subject
add/edit/delete/filter question
Merge pull request #5 from nguyenhoa/question

Question
create exam for subject
Merge pull request #6 from nguyenhoa/update_exam

create exam for subject