fix: fix MediaQuery.upTo()
fix: fix MediaQuery.upTo()

MediaQuery.upTo() should return whether the screen is within a breakpoint or smaller. The previous implementation had an incorrect algorithm.

The new implementation is more divided and documented, making the algorithm way more clear and auditable.

DaSchTour/foundation-sites,zurb/foundation,zurb/foundation-sites,zurb/foundation-sites,zurb/foundation-sites,zurb/foundation,zurb/foundation,DaSchTour/foundation-sites