When a default route gateway is specified, also route all multicast via the bridge interface
Support routing any number of networks via the container interface
o Document the new --route ... option
o Parse arguments a with more flexibilty, and full backward compatibilty
o Clean up conditionals to use if ...; then instead of short-circuit
o Quote variable tests
o Log a play-by-play if -v|--verbose option given
Report if unable to create files/links required, and suggest sudo