Clean up about fragment. Also update permissions for gradle wrapper.

I wasn't able to test this on a real device, but this kind of what the new layout look like.

![screen](https://f.cloud.github.com/assets/843979/1819889/9ea13238-70b9-11e3-93c2-59586e12be65.png)

The links are to your Github and G+ profile. I also want to test this out in landscape on smaller phones to see if the content fits. I'll get around to it, just wanted to find out if you had any suggestions.

I also updated the permissions for the gradle wrapper to be executable.