Ability to specify linux logging location

[GoogleCodeExporter]

Currently, using the -writelog argument causes the linux version of gdocbackup 
to write a log to /tmp/GDocBackup_yyyyMMdd.log

I would like the ability to specify a log location (ex: /var/log/gdocbackup) so 
that these can be more easily located and managed by utilities like logrotate.

Original issue reported on code.google.com by [email protected] on 4 Jan 2013 at 1:42