Package string utils.

src/utils/string.js

@@ -0,0 +1,18 @@
+/**
+String utility functions.
+@license Copyright (c) 2015 by James M. Devlin. All rights reserved.
+*/
+
+/**
+Determine if the string is null, empty, or whitespace.
+See: http://stackoverflow.com/a/32800728/4942583
+@method isNullOrWhitespace
+*/
+
+String.isNullOrWhitespace = function( input ) {
+  return !input || !input.trim();
+};
+
+String.prototype.endsWith = function(suffix) {
+  return this.indexOf(suffix, this.length - suffix.length) !== -1;
+};