Fixed bug that didn't properly link headlines with commas

Author: Sethen Maleno

markdown-include.js

@@ -75,6 +75,10 @@ exports.buildLink = function (title, anchor) {
  */
 exports.buildLinkString = function (str) {
 	var linkPatterns = {
+		comma: {
+			pattern: /,\s+/g,
+			replace: ''
+		},
 		backtick: {
 			pattern: /`/g,
 			replace: ''