Remove unused functions

docs/documentation/overview/functions.html

@@ -19,8 +19,6 @@ doc-subtab: functions
         <li><code>powerNumber($number, $exp)</code>: calculates the value of a number exposed to another one. Returns a number.</li>
         <li><code>colorLuminance($color)</code>: defines if a color is dark or light. Return a decimal number between 0 and 1 where <= 0.5 is dark and > 0.5 is light.</li>
         <li><code>findColorInvert($color)</code>: returns either 70% transparent black or 100% opaque white depending on the luminance of the color.</li>
-        <li><code>removeUnit($number)</code>: removes the unit of a Sass number. So "10px" becomes "10" and "3.5rem" returns "3.5". Used for string concatenation.</li>
-        <li><code>roundToEvenNumber($number)</code>: rounds a number to the closest but lower even one. So 23 becomes 22, and 7.5 returns 6.</li>
       </ul>
     </div>
   </div>

sass/utilities/functions.sass

@@ -26,11 +26,3 @@
     @return rgba(#000, 0.7)
   @else
     @return #fff
-
-@function removeUnit($number)
-  @if type-of($number) == 'number' and not unitless($number)
-    @return $number / ($number * 0 + 1)
-  @return $number
-
-@function roundToEvenNumber($number)
-  @return floor($number / 2) * 2