New Yosemite icon

Title says it all.
![screen shot 2014-08-09 at 1 53 26 pm](https://cloud.githubusercontent.com/assets/5308655/3867631/9a2744a0-2008-11e4-9e3e-e2953e1d84c7.png)

Make sure you update the "App icon by icons8.", the icon itself, and the screenshot on the website.