Reworked the menu icon and added a retina version


Because Mavericks dims the status bar on inactive secondary monitors now, the old icon's white interior bothered me, so I tried to make a better version.  I also wanted to make sure there was a retina-ized icon as well (I had to modify a small bit of code to make that work).  Hope you like it :)

Old:
![screen shot 2013-11-15 at 9 40 29 pm](https://f.cloud.github.com/assets/3310870/1579213/a7c7eda2-5192-11e3-836a-73a55f30433d.png)
New:
![screen shot 2013-11-19 at 10 17 00 pm](https://f.cloud.github.com/assets/3310870/1579214/ae488a38-5192-11e3-9f00-8279384af290.png)