Fix Upgrading/Installing log message
Replace --cfg with --ignoreconfig and --prestartfile

--prestartfile FILE can be repeated, `omero load FILE` will be run before starting the server.
Remove --web arg
Remove memory configuration
Fix typo in help
Remove --mem argument
Merge pull request #52 from manics/prestart_load

Replace the old upgrade --cfg arg with --prestartfile passed to `omero load`