Fixed tables

This commit will fix:

- Tables. This requires that you install the `pander` package.
- It also addresses the issue with unreadable code blocks in #22. For readability, especially for novices, I removed the excessive nesting and split up the code a little bit. I also added `tidy = FALSE` to that chunk to override knitr/formatR from reflowing it.
One more space indent needed on this line.