Finish helper functions

Created a helper.rb file that contains the helper functions for the auth-client
I might change this to a module and name it something different. Then you can do this in the user/admin/whatever class. 
```ruby
class User
  include BypassAuth::Authenticate
  
  def valid_session?
    validate_session(token)
  end
end
```
If you go this route, you'll also want to change these from class to instance methods