create attendances model and controller add link in courses page
add attendance_time to attendances table
add attendance with drop down list to select course and account
remeber course and account when edit attendance
selecte account with checkbox to create attendance
change the style of accounts in the create attendance page
attendances stat with course,return account index after create and edit account success
add will page to account index page
account's detail page of attendance show all courses
add will page for detail page of attendance
finished attendances in account page
change create attendance page display course name and the account name of the course
Merge pull request #1 from ruoshuigao/master

add attendances function for admin