Added scaling variabled. Put golden ratio into own partial

app/assets/stylesheets/_bourbon.scss

@@ -11,6 +11,7 @@
 @import "functions/compact";
 @import "functions/flex-grid";
 @import "functions/grid-width";
+@import "functions/golden-ratio";
 @import "functions/linear-gradient";
 @import "functions/modular-scale";
 @import "functions/px-to-em";

app/assets/stylesheets/functions/_golden-ratio.scss

@@ -0,0 +1,3 @@
+@function golden-ratio($value, $increment) {
+  @return modular-scale($value, $increment, $golden)
+}

app/assets/stylesheets/functions/_modular-scale.scss

@@ -1,11 +1,34 @@
+// Scaling Varaibles
+$golden:           1.618;
+$minor-second:     1.067;
+$major-second:     1.125;
+$minor-third:      1.2;
+$major-third:      1.25;
+$perfect-fourth:   1.333;
+$augmented-fourth: 1.414;
+$perfect-fifth:    1.5;
+$minor-sixth:      1.6;
+$major-sixth:      1.667;
+$minor-seventh:    1.778;
+$major-seventh:    1.875;
+$octave:           2;
+$major-tenth:      2.5;
+$major-eleventh:   2.667;
+$major-twelfth:    3;
+$double-octave:    4;
+
 @function modular-scale($value, $increment, $ratio) {
   $v1: nth($value, 1);
   $v2: nth($value, length($value));
   $value: $v1;
 
   // scale $v2 to just above $v1
-  @while $v2 > $v1 { $v2: ($v2 / $ratio); } // will be off-by-1
-  @while $v2 < $v1 { $v2: ($v2 * $ratio); } // will fix off-by-1
+  @while $v2 > $v1 {
+    $v2: ($v2 / $ratio); // will be off-by-1
+  }
+  @while $v2 < $v1 {
+    $v2: ($v2 * $ratio); // will fix off-by-1
+  }
 
   // check AFTER scaling $v2 to prevent double-counting corner-case
   $double-stranded: $v2 > $v1;
@@ -24,7 +47,9 @@
 
   @if $increment < 0 {
     // adjust $v2 to just below $v1
-    @if $double-stranded { $v2: ($v2 / $ratio); }
+    @if $double-stranded {
+      $v2: ($v2 / $ratio);
+    }
 
     @for $i from $increment through -1 {
       @if $double-stranded and ($v1 / $ratio) < $v2 {
@@ -39,27 +64,3 @@
 
   @return $value;
 }
-
-//  div {
-//                     Increment Up GR with positive value
-//   font-size:        modular-scale(14px,   1, 1.618); // returns: 22.652px
-//
-//                     Increment Down GR with negative value
-//   font-size:        modular-scale(14px,  -1, 1.618); // returns: 8.653px
-//
-//                     Can be used with ceil(round up) or floor(round down)
-//   font-size: floor( modular-scale(14px, 1, 1.618) ); // returns: 22px
-//   font-size:  ceil( modular-scale(14px, 1, 1.618) ); // returns: 23px
-//  }
-//
-// modularscale.com
-
-@function golden-ratio($value, $increment) {
-  @return modular-scale($value, $increment, 1.618)
-}
-
-//  div {
-//    font-size: golden-ratio(14px, 1); // returns: 22.652px
-//  }
-//
-// goldenratiocalculator.com