update transit fetching cron to kill cut_tiles

[kevinkreiser]

when we get new transit data we want to make use of it ASAP. to do so all we need to do is gracefuly kill the cut_tiles.sh script and the valhalla_build_tiles program. simple psgrep to get the pids, followed by kill to the script. if the script is dead a smiple kill to the program should suffice. if the script didnt die, kill it with -9 and go remove the lock file, and continue on to the program. if the program didnt use -9 on that.