SKILL-2: As a guest I can receive the student profile by id

Michael, 
can you please rename it back to students.rb ?
That's my bad ;-) Peter had a good point that it's generated file. 
The reason why it's plural is that it can have several all the factories (if we need it):

 ```ruby
require "faker"

FactoryGirl.define do
  factory :student do
    name Faker::Name.name
    email Faker::Internet.email
  end

  factory :student_with_60_digits_phone_number do
    name Faker::Name.name
    email Faker::Internet.email
    phone_number Faker::PhoneNumber.subscriber_number 60
  end
end
```