add quiz_block_file
add quiz_block_last_updated for saving last updated time for  quiz block
initial manage lab view
add demo_course_id to store Lab's demo course
custom property to properly get quiz_block_file
method to update quiz_block_last_updated
function to update all course quizblock from 1 lab
view to update lab's quiz block
update master's lab as well
Merge branch 'labster/feature/manage-lab' into labster/master