Fixing a bug in the GPX importer library (#19)

src/lib/gpx-parser-builder/src/person.js

@@ -3,7 +3,9 @@ import Link from './link';
 export default class Person {
   constructor(object) {
     this.name = object.name;
-    this.email = object.emil;
-    this.link = new Link(object.link);
+    this.email = object.email;
+    if (object.link) {
+      this.link = new Link(object.link);
+    }
   }
 }