Allow signedRoutes

[rompetomp]

Add an option to use signedRoute instead of route in the route function

[inxilpro]

Sorry, I missed this somehow!

This is great. I think it would make more sense, though, to just add a new signedRoute method, since the signature is different. That would allow for the expiration parameter to match, too. Would you mind making that change?

Also, can you add a test to FormTest?