Added expand optional parent child route tests
Added expand optional parent child route tests

Equivalent to abc/{x?} + /def/{y} because x? is made mandatory in second
route. But, abc+/{x}+/def/{y} is more expressive

grahammendick/navigation,grahammendick/navigation,grahammendick/navigation,grahammendick/navigation,grahammendick/navigation,grahammendick/navigation,grahammendick/navigation