Fix heroku

Hi @carolinevcarter,

- I added some file that Heroku needs to run your project
- You should edit your files in `_posts`, and have **no spaces** in the filenames, and **no upper case letters**. It breaks your navigation. For instance, rename `2014-08-31-Opa! Going Greek.markdown` to `2014-08-31-opa-going-greek.markdown`

Good luck!