New Feature: Lesson Plan will auto-open in current week
Refine implementation: consider next milestone's start_time as current one's end time
Merge remote-tracking branch 'upstream/development' into feature/auto-open-courseplan
Merge pull request #191 from wangqiang1208/feature/auto-open-courseplan

New Feature: Lesson Plan will auto-open in current week
Merge branch 'development' of github.com:Coursemology/coursemology.org into Deploy