Add user sign up and sign in
- Feature and controller tests for sign up with valid/invalid attributes
- Feature tests for user sign in
- Created sessions controller and sessions helper to set our session
- BCrypt handling password hashing
- Began model tests for user - need to add more
Merge pull request #1 from JohnathanWeisner/user-signup-signin

Add user sign up and sign in
Merge pull request #2 from JohnathanWeisner/user-signup-signin

Add user sign up and sign in
Merge pull request #4 from JohnathanWeisner/master

sessions
fix merge conflicts