added basic user authorization

@RichardBlair 
Updated routing, controllers, and views in adding user authentication to dickbook to match Rails 4.1.1 standards utilizing information from the following resources:

http://railscasts.com/episodes/250-authentication-from-scratch
https://github.com/rails/strong_parameters
and, of course, advice from https://github.com/RichardBlair
Give these users names, so they are easy to remember.

I'm going to call him bob. Also, add real hashes. You can use the rails console to generate them. Fire up your rails console and do:

```
user = User.new
user.password = "funFuckingPassword"
user.encrypt_password
user.password_hash
```