add execSync dependency
add execSync dependency

freedomgames/Planet-Lab,freedomgames/Planet-Lab,nicktimko/Planet-Lab,freedomgames/Planet-Lab,nicktimko/Planet-Lab,andymcguinness/Planet-Lab,nicktimko/Planet-Lab,andymcguinness/Planet-Lab,nicktimko/Planet-Lab,andymcguinness/Planet-Lab