NASA SpaceApps 2018 Version

This version has a few tweaks that were used to simulate the space squid for the NASA SpaceApps Challenge 2018. They basically allow a muscle attached to just one body to generate a directed force that can be used to simulate the rocket engine required for this challenge. It is a bit of a hack but it works. There are also a few bug fixes on the targeting. This has only been tested on Windows so there is only a Windows binary, however it will almost certainly compile up OK on a Mac too.