Merge pull request #55 from danawoodman/patch-1

Fix crashes in React Native "navigator is not defined"

lib/browser.js

@@ -16,15 +16,15 @@ var utf8 = require('utf8');
  * http://ghinda.net/jpeg-blob-ajax-android/
  */
 
-var isAndroid = navigator.userAgent.match(/Android/i);
+var isAndroid = typeof navigator !== 'undefined' && /Android/i.test(navigator.userAgent);
 
 /**
  * Check if we are running in PhantomJS.
  * Uploading a Blob with PhantomJS does not work correctly, as reported here:
  * https://github.com/ariya/phantomjs/issues/11395
  * @type boolean
  */
-var isPhantomJS = /PhantomJS/i.test(navigator.userAgent);
+var isPhantomJS = typeof navigator !== 'undefined' && /PhantomJS/i.test(navigator.userAgent);
 
 /**
  * When true, avoids using Blobs to encode payloads.