Update splash screen

Add some setup steps - configure git and install command line tools.
![screen shot 2014-11-23 at 5 54 06 pm](https://cloud.githubusercontent.com/assets/574393/5158081/cce337f8-7339-11e4-83ac-4f709d47d163.png)

If we're being really nitpicky, in macs it's `.bash_profile`