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
fix travis build
Merge branch 'fix/travis-build' of https://github.com/cgcgbcbc/CloudComputing into cgcgbcbc-fix/travis-build

Conflicts:
	lib/tasks/travis-ci.rake
把未完成的feature从master分支中删除
add visitor_index.feature for feature/visitor_index branch
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