Issue #312 - enforce filesystem limits

Closes #312
@alicoding yeah you should just remove that object from the srcList, and send that path back to the client in a new syncmessage so that the client can possibly trigger an error event for that path but the serve should continue to generate checksums for the srclist(without the oversized file path) and continue with the sync process. But, you might want to edit rsync so that the path that was oversized does not get deleted during the patch step