fatal: Could not parse object '339d9fce17c4223d9b25e08b60bd6925ff1093c9'.
From https://github.com/NASA-Tensegrity-Robotics-Toolkit/NTRTsim
 * branch            master     -> FETCH_HEAD
HEAD is now at 339d9fc setup_bullet now checks if patched directory exists, skips patching if it does. Solves #18
339d9fce17c4223d9b25e08b60bd6925ff1093c9