Removed unused pid_directory attribute.
Use sql_idle_timeout that's configured in the GUI instead of hard coding.
Merge pull request #161 from cdearborn/pull-req-release-roxy-master-9d89523b01ec46e12b01c32a850645c1d4bb517a

Merging fix from hydrogen where sql_idle_timeout is configured in the GUI, but is ignored [1/1]