added songs model
Merge pull request #15 from stevenaweiss/master

user can logout
Merge pull request #16 from stevenaweiss/master

user can login and logout
session ID set at sign up. valudate uniqueness of e-mail. changed e-mail field in sign up to type e-mail
store id session on signup
Merge pull request #17 from Tunneylax20/store_id_session_on_signup

Store id session on signup
login logout hide buttons