Fix special case where "/" would match with all paths

[rgigger]

I noticed that if I put my "/" route first that it would match with all paths, so I had to list it as the last path in order for anything to work. I am not sure if adding another special case rule is the best way to fix but it does seem to do the job. This causes MacroExpress to now match the behavior of exress.js in the same situation.

[helje5]

I think Macro currently does a prefix match on all calls. So I think we would rather want to change that if Express.js does exact matches?

[rgigger]

Yes, I think that's right. Currently Macro does a prefix match in the sense that a route using the pattern '/cows' will match with a path of '/cows/list' but it won't match with say '/cowss'. But yeah the express behavior is to not match either of those. I will generalize it do exact matches everywhere and update the PR.

[helje5]

I recently added some "route" tests, would be cool to have those in sync as well and test the desired behavior.

I wonder whether prefix matching '/cows' is currently required for mounting, or whether that needs special behavior then.