Added client side validation check to image uploader
Added not_found method to redirect to 404
Redirect to 404 when submission is nil
Change the way system_role_id is assigned
Merge branch 'master' into jsyeo-image-upload-image-size
Dismiss modal and show alert
fix activity cache (cached timestamp previously )
add flag for eval coding question in submission grading
Merge pull request #43 from jsyeo/jsyeo-fix-method-not-found-ex

Fix method not found exception
Merge pull request #45 from jsyeo/jsyeo-dont-mass-assign-fix

Don't mass assign system_role_id in generated data
Merge pull request #46 from jsyeo/jsyeo-image-upload-image-size

Validate image and show alert
Merge branch 'development' of github.com:Coursemology/coursemology.org into dev/raymoond_dev
revert back commented out cache for tutor group
redirect to edit if grading exist at the beginning of the controller
don't send of annotation if mission is not published
fix last fix's error =_=
run all test cases for private and public test cases