Adding calendar feature
Adding selective list to lesson table
for merge
Lesson table with filter and some rspec testing renewed
Edit lesson page added.
Edit lesson table
Edit lesson table page added
solve conflict and migrate
Edit lesson table finished
Some label effect
Merge branch 'master' of https://github.com/Thu-SaaS-CloudComputing/CloudComputing into feature/lesson_table
to make the build pass
Lesson finished, not enough test
Pass all test
Test for lesson table finished
add some rspec test
save for later change --KevinXu
trying to merge