Support for --quiet and --dry-run options.
Merge pull request #8 from johntconklin/master

Use os.path.join() to create pathname used by "p4 fstat" commands.
Fix bug: don't change symlink source file permissions.
Merge branch 'feature/dry_run' of https://github.com/johntconklin/p4clean into johntconklin-feature/dry_run

Conflicts:
	p4clean.py
Update README file.