Add issues basic line chart with dates

Includes a basic line chart of the user's mood.

Removed the factories, increased the readability, decreased the abstraction, yet kept it DRY. I hope this is better for you!

![shot](https://f.cloud.github.com/assets/692702/320936/3b6f2310-997c-11e2-804f-d8d8a3e88434.png)