Sexier menubar icons

I changed the menubar icons to better fit the style of Mac menubar icons. Here's what they look like.

![on](https://f.cloud.github.com/assets/1623613/211562/c20ec0e4-82b9-11e2-9141-7ef95066d734.png)
![off](https://f.cloud.github.com/assets/1623613/211563/c20f1e40-82b9-11e2-9fc6-db3126c6cc59.png)