Add stream.js to dist build

The dist build was broken because stream.js was not being included properly.

@@ -30,6 +30,7 @@ module.exports = function(grunt) {
               'src/h264-stream.js',
               'src/aac-stream.js',
               'src/segment-parser.js',
+              'src/stream.js',
               'src/m3u8/m3u8-parser.js'
              ],
         dest: 'dist/videojs.hls.js'