/forceKeepUp now keeps up on garbage collection as well
Renamed /forceSave to /forceKeepUp to reflect that it also keeps up on garbage collection.
When the server is floating at >80% memory for too long, try invoking a GC. This fixes the issue where the default Java GC options would have it float at 80% memory forever as long as nothing forced it to catch up.
Cleaned up /verbose output a little.
Check if we have <200Megs free in addition to <20% free, prevents out of memory errors on 512Meg ram servers (which this plugin doesn't technically support)
