Added function to create an admin user for development
Added function to create an admin user for development

Once a development database has been initiated an admin user can be
easily created by running 'manage.py shell' and executing
'User.generate_dev_users()'. The users email is 'admin@example.com' and
the password is 'admin'.

jykntr/wishapp,jykntr/wishapp,jykntr/flaskapp,jykntr/flaskapp