Merge pull request #6 from gmini196/admin

sign-in-out admin
Create examination
Merge pull request #7 from ducnhat1989/examination_task

Create examination
Edit examination
Merge pull request #8 from ducnhat1989/examination_edit_task

Edit examination
Delete examination
Merge pull request #9 from ducnhat1989/examination_destroy_task

Delete examination
Merge pull request #10 from gmini196/admin_edit

delete-edit-show user
taskAddQuestion
Merge pull request #11 from HaChan/taskAddQuestion

taskAddQuestion
create new user