change path for startup script

2013-07-12T20:17:56.291672+00:00 heroku[web.1]: Starting process with command `./startup.sh`
2013-07-12T20:17:57.389527+00:00 app[web.1]: bash: ./startup.sh: No such file or directory
2013-07-12T20:17:59.477999+00:00 heroku[web.1]: Process exited with status 127