Print with all the colors of the wind

Forcing black-and-white text & backgrounds is too harsh. Printing speed isn't everything.
Users or authors can easily enable grayscale themselves if need be.

scss/_print.scss

@@ -9,9 +9,7 @@
   *,
   *:before,
   *:after {
-    color: #000 !important; // Black prints faster: h5bp.com/s
     text-shadow: none !important;
-    background: transparent !important;
     box-shadow: none !important;
   }