added whenever gem, changed action name to reminder_email
added scheduler file, modified parameter name in system_reminders to avoid conflict
fixed bugs in scheduler.rb
fix in schedule.rb
added send_reminder_mails method to student.rb
modified schedule.rb to call send_reminder_mails in student model
added link to challenging problem
updated schedule.rb
Merge branch 'master' into C5_Amir_145_system_reminders_5.4
added smtp configuraion for mail
indentation fixes
added gem with description
added deploy config for whenever gem
documentation
fixed mail body
fixed conflicts
doc fix
fixed logical error
fix 1 in documentation
fix 2 in documentation