make positions for channels and roles nicer (#1211)

* make role calculated position nicer

* make channels sortable in a nice way too

* stupid git web rebase editor

* Update Guild.js

* Update Guild.js

* Update Guild.js

* Update Guild.js

* Update RESTMethods.js

src/util/Collection.js

@@ -369,6 +369,18 @@ class Collection extends Map {
       return testVal !== value || (testVal === undefined && !collection.has(key));
     });
   }
+
+  /**
+   * The sort() method sorts the elements of a collection in place and returns the collection.
+   * The sort is not necessarily stable. The default sort order is according to string Unicode code points.
+   * @param {Function} [compareFunction] Specifies a function that defines the sort order.
+   * if omitted, the collection is sorted according to each character's Unicode code point value,
+   * according to the string conversion of each element.
+   * @returns {Collection}
+   */
+  sort(compareFunction = (x, y) => +(x > y) || +(x === y) - 1) {
+    return new Collection(Array.from(this.entries()).sort((a, b) => compareFunction(a[1], b[1], a[0], b[0])));
+  }
 }
 
 module.exports = Collection;