Allow modules with route of / to be in take over mode

This is possible now, but with some messy boiler plate. The only reason it doesn't work is because the regex of / in the routing service doesn't match any routes since we strip the leading slash so /foo actually comes through as foo/.

Adding this check into our if statement will allow a route of `/` to match anything which will cause the routing service to properly enter the module routes for that module.

Also, when we detect a module in take over mode, should we add the `/parent` route by default, or leave that up to the developer? Perhaps a this.parentRoute in the moduleconfig? Not sure if that is really necessary or just bloat since it's really just a couple lines of code in onLoad() to manually do that.