New: Higher Contrast XCodeCapp menubar icons

This commit changes the current XCodeCapp menubar icon to use higher contrast colours, making it easier to see when XCC is working or idle.

Previously, the colours were black and dark green. With this change, the colours are black and orange (taken from the Cappuccino logo).

This commit includes the original PSD artwork as well as rendered versions of the icons in PNG format.

Below is a comparison of before/after this commit. (left: current; right: this commit).

![xcodecapp-icons](https://f.cloud.github.com/assets/163183/270768/ca0d3b96-8fd3-11e2-88c9-3cc6e89378bd.png)