Table: increase vertical spacing

- Increases vertical cell spacing (padding-top / padding-bottom)
- Adds a newline and some vertical spacing beneath the table.

**Before:**
![before](https://cloud.githubusercontent.com/assets/7469/3241178/b31f38bc-f139-11e3-812f-aed9760ffd6a.png)

**After:**
![after](https://cloud.githubusercontent.com/assets/7469/3241177/b31f1b8e-f139-11e3-8a91-cf829d8bedb3.png)

// @maethu