multiple updates

1.) the Jetty version changed
2.) used the correct log dir env var
3.) replaced all OPENSHIFT_INTERNAL_* vars with OPENSHIFT_DIY_*
4.) Kill jetty.pid in stop.sh only if the process is running -- otherwise, you get a "remote: bash: line 4: kill: (15683) - No such process" on the next push
5.) if the previous startup failed (ie, Jetty version was wrong), ${OPENSHIFT_DATA_DIR}jetty may not exist -- gracefully handle in stop.sh