remove set -e, some tests were causing the script to exit silently, upda...

Minor updates, and removing set -e. The script was exiting silently when testing for existence of files/commands.
I'll investigate a different workaround, but launchd.conf is no longer supported in yosemite.
http://stackoverflow.com/questions/25385934/setting-environment-variables-via-launchd-conf-no-longer-works-in-os-x-yosemite/26311753#26311753