[fluxible-router] case-sensitive routing

the routing in fluxible-router is case insensitive currently. i'd like to use case-sensitive routing..

it seems that fluxible-router uses routr, which in turn uses path-to-regexp, which has an option for this, but it's not possible to pass down this option to it.

basically this line https://github.com/yahoo/routr/blob/master/lib/router.js#L38 needs to get an additional {sensitive:true} param at the end.

what would be the best way to achieve this? (to be able to choose case-sensitive routing)