Merge pull request #4 from caiduoi/develop

Create model and database (fix seeds.rb)
Merge pull request #5 from caiduoi/develop

Fix create db
R&D again, Create, show, list, destroy, update courses and task
Merge pull request #7 from caiduoi/develop

Create, view, delete courses & tasks
Merge pull request #7 from caiduoi/develop

Create, view, delete courses & tasks
Merge pull request #8 from SonChee/develop

view list trainee
Lasst
Merge pull request #6 from PhamPhi/develop

Login In/Logout
List all courses
Merge pull request #12 from PhamPhi/develop

List all courses