using `-hide-down` with with other grid classes

[epixian]

Using hide-down classes with other grid classes may cause issues when the viewport is exactly breakpoint pixels wide

Example:
<div class="tab-hide-down med-12"></div> at 1024px

Probably other breakpoints as well.

[epixian]

fix looks to be subtracting 1px from the max-width for the hide-down classes