added data directory to .gitignore
added data directory to .gitignore

MaxReimann/Troen,MaxReimann/Troen,philippotto/GP2013,MaxReimann/Troen,philippotto/GP2013,philippotto/GP2013,MaxReimann/troen-simulator,MaxReimann/troen-simulator,philippotto/GP2013,philippotto/GP2013,MaxReimann/troen-simulator,MaxReimann/Troen