[bugfix] upload base64 do not need to encode UTF8.

Author: wangxiao

lib/browserify-wrapper/parse-base64.js

@@ -5,7 +5,7 @@ var dataURLToBlob = function(base64) {
   if (base64.split(',')[0] && base64.split(',')[0].indexOf('base64') >= 0) {
     base64 = base64.split(',')[1];
   }
-  return new Buffer(base64, 'base64').toString('utf8');
+  return new Buffer(base64, 'base64');
 };
 
 module.exports = dataURLToBlob;