adding 'to-string' function

stylesheets/encode/encode.scss

@@ -1,4 +1,5 @@
 // Helpers
+@import "helpers/to-string";
 @import "helpers/quote";
 
 // Type specific encoding functions

stylesheets/encode/helpers/_to-string.scss

@@ -0,0 +1,21 @@
+// Joins all elements of `$list` with `$glue`
+// @access private
+// @param {List} $list - list to cast
+// @param {String} $glue ('') - value to use as a join string
+
+@function to-string($list, $glue: '', $is-nested: false, $recursive: false) {
+	$result: null;
+	@for $i from 1 through length($list) {
+		$e: nth($list, $i);
+		@if type-of($e) == list and $recursive {
+			$result: $result#{to-string($e, $glue, true)};
+		}  
+		@else {
+			$result: if(
+				$i != length($list) or $is-nested, 
+				$result#{$e}#{$glue}, $result#{$e}
+			);
+		}
+	}
+	@return $result;
+}