update Install_gazebo_and_drcsim.sh
update Install_gazebo_and_drcsim.sh

- don't assume source dir is located at ~/drc
- setup required ROS environment before building sandia-hand

git-svn-id: 3bdc50f1ba932488e36d0c1d1e7fc079467b8f9b@5769 c7283977-0100-402a-a91a-fa70b306dbfe

openhumanoids/oh-distro,openhumanoids/oh-distro,openhumanoids/oh-distro,openhumanoids/oh-distro,openhumanoids/oh-distro,openhumanoids/oh-distro,openhumanoids/oh-distro,openhumanoids/oh-distro