Markdown rendering improvements

- [ ] There is not enough space between the last bullet point in a list and the following paragraph:

![screen shot 2014-10-13 at 12 46 00](https://cloud.githubusercontent.com/assets/109850/4612881/981ceb62-52ce-11e4-9d26-ec07b73a2c17.png)

- [ ] The initial post in a discussion should also be rendered as Markdown