Specs votes and favorites

Take a look at the changes (you can pull down locally and check out the files there, as that might be easier to see) and let me know if you have any questions!

To merge this pull request, just do use the big green merge button, that will mere my changes into your github master branch.

Then you'll need to pull down the changes locally, to do this just do:

```bash
git pull origin master
```

Then you'll need to run `rake db:migrate` for the database changes to take effect. Once you've done that you'll see voting and favoriting and your specs should all be green! :D

Let me know if you have any questions about the process or the changes I've made.