Skip solved tasks when running with test cases.
Merge branch 'master' into mcc2014demo
Ensure answer passed into grader is always a string.
Merge branch 'master' into mcc2014demo
Disable submit button for solved tasks.
Merge branch 'master' into mcc2014demo
Add stub column to problems.
Able to set problems stub.
Set stub to be the default code snippet.
Merge branch 'master' into mcc2014demo