Add routing settings to the CLI

[johnsudaar]

• Force HTTPS
• Sticky session
• Canonical

[EtienneM]

I don't really know what would be the best command name for these commands.. Actually canonical domain is a bit different than the others. Suggestions:

• scalingo -a my-app routing-settings [force-https | sticky-session]-enable
• scalingo domains-canonical-[un]set to stick with the other Custom Domains commands
• scalingo canonical-domais-[un]set

[johnsudaar]

I think that something like:
scalingo -a my-app [force-https | sticky-session] [enable|disable]
scalingo -a my-app canonical-domain set [domain-name]
scalingo -a my-app canonical-domain unset
scalingo -a my-app canonical-domain get

Would be pretty nice.