Fixing margin that cut off icons on homepage

On the homepage, the icons cut off at the top due to the negative padding. It occurred in all browsers as well. Here's the before:

![before](https://cloud.githubusercontent.com/assets/1043478/2533790/e954758a-b568-11e3-8b36-679d00285b51.png)

Here's the after screenshot:

![after](https://cloud.githubusercontent.com/assets/1043478/2533791/fb6f14dc-b568-11e3-8857-7b29436c2a0d.png)

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Thanks for all the fantastic front end tools y'all are building! They have help my workflow tremendously, and are so much better/more well built than any of the alternate tools. It's great to have such inspiring people in the community.