make virtualenv_activate script a little more explicit
#!/usr/bin/env bash
+# Environment variables may not be loaded under all conditions.
+if [ -z "${TWLIGHT_HOME}" ]
+then
+ source /etc/environment
+fi
+
# Start in TWLight user's home dir.
-cd ~
+cd /home/${TWLIGHT_UNIXNAME}
# Suppress a non-useful warning message that occurs when gunicorn is running.
virtualenv TWLight 2>/dev/null
