Dlc 12

- Admins can sign in and sign out, seeing a personalized dashboard.
- Sign in at /signin
- create an admin to test with on your own database using

`rails console`

`Admin.create(name: "Your Name", email: "yourname@example.com",
password: "foobar", password_confirmation: "foobar")`
- @Saityi 

![sessions0](https://cloud.githubusercontent.com/assets/6411175/3418786/705087da-fe4e-11e3-9a70-a59be5bf7e66.png)
![sessions1](https://cloud.githubusercontent.com/assets/6411175/3418788/76cabd1a-fe4e-11e3-888d-296423f15116.png)