Merge pull request #118 from gutworth/add-xhr-source

add xhr.js to Gruntfile.js

@@ -31,7 +31,8 @@ module.exports = function(grunt) {
               'src/segment-parser.js',
               'src/stream.js',
               'src/m3u8/m3u8-parser.js',
-              'src/playlist-loader.js'
+              'src/playlist-loader.js',
+              'src/xhr.js',
             ],
         dest: 'dist/videojs.hls.js'
       }