Add Friendly ID to students.
Merge pull request #13 from helenalissenko/master

New Task Mailer
Merge pull request #14 from Ki-csen/master

Add Friendly ID to students.
Config
nickname
Added devise_invitable for Students
merged upstream changes
Merged nickname task
Added stats page
Link
Link2
Merged Devise Invitable strategy.
Merged Devise Invitable strategy2.