#226 Remove flow type annotations

src/android.js

 // Copyright 2016 wkh237@github. All rights reserved.
 // Use of this source code is governed by a MIT-style license that can be
 // found in the LICENSE file.
-// @flow
 
 import {
   NativeModules,

src/class/RNFetchBlobFile.js

 // Copyright 2016 wkh237@github. All rights reserved.
 // Use of this source code is governed by a MIT-style license that can be
 // found in the LICENSE file.
-// @flow
 
 
 import {

src/class/RNFetchBlobReadStream.js

 // Copyright 2016 wkh237@github. All rights reserved.
 // Use of this source code is governed by a MIT-style license that can be
 // found in the LICENSE file.
-// @flow
 
 import {
   NativeModules,

src/class/RNFetchBlobSession.js

 // Copyright 2016 wkh237@github. All rights reserved.
 // Use of this source code is governed by a MIT-style license that can be
 // found in the LICENSE file.
-// @flow
 
 import {
  NativeModules,

src/class/RNFetchBlobWriteStream.js

 // Copyright 2016 wkh237@github. All rights reserved.
 // Use of this source code is governed by a MIT-style license that can be
 // found in the LICENSE file.
-// @flow
 
 import {
  NativeModules,

src/class/StatefulPromise.js

 // Copyright 2016 wkh237@github. All rights reserved.
 // Use of this source code is governed by a MIT-style license that can be
 // found in the LICENSE file.
-// @flow
 
 export default class StatefulPromise extends Promise {
 

src/fs.js

 // Copyright 2016 wkh237@github. All rights reserved.
 // Use of this source code is governed by a MIT-style license that can be
 // found in the LICENSE file.
-// @flow
 
 import {
   NativeModules,

src/index.js

 // Copyright 2016 wkh237@github. All rights reserved.
 // Use of this source code is governed by a MIT-style license that can be
 // found in the LICENSE file.
-// @flow
 
 import {
   NativeModules,

src/ios.js

 // Copyright 2016 wkh237@github. All rights reserved.
 // Use of this source code is governed by a MIT-style license that can be
 // found in the LICENSE file.
-// @flow
 
 import {
   NativeModules,

src/net.js

 // Copyright 2016 wkh237@github. All rights reserved.
 // Use of this source code is governed by a MIT-style license that can be
 // found in the LICENSE file.
-// @flow
 
 import {
   NativeModules,