Merge branch 'master' into 0.7.0

README.md

 
 | Version | |
 |---|---|
+| 0.6.4 | Fix rnpm link script. |
 | 0.6.3 | Fix performance issue on IOS, increase max concurrent request limitation from 1. |
 | 0.6.2 | Add support of asset file and camera roll files, Support custom MIME type when sending multipart request, thanks @smartt |
 | 0.6.1 | Fix #37 progress report API issue on IOS |

package.json

 {
   "name": "fetchblob",
-  "version": "0.6.3",
+  "version": "0.6.4",
   "private": true,
   "scripts": {
     "start": "node node_modules/react-native/local-cli/cli.js start",

src/package.json

 {
   "name": "react-native-fetch-blob",
-  "version": "0.6.3",
+  "version": "0.6.4",
   "description": "A module provides upload, download, and files access API. Supports file stream read/write for process large files.",
   "main": "index.js",
   "scripts": {