use point-line icon for data

I don't like that we use the hamburger for data. We should switch to `point-line` everywhere to represent data:
![screen shot 2014-03-14 at 12 33 07 pm](https://f.cloud.github.com/assets/108094/2423198/7e88147c-ab96-11e3-8499-de544e13e9b6.png)