remove student_activity_center.
Merge pull request #6 from shonenada/remove-useless-folder

remove student_activity_center.
add mroom models and forms
add strategies to metting_room
add Field entity, add tabel and table templates
fix some bug in mroom table
samll revise
Merge pull request #7 from HxSeek/feature/mroom

Feature/mroom
refactor function in time_table
Merge pull request #8 from shonenada/refactor/time_table

refactor function in time_table