add Clipboard component for ios and android

Summary:
add Clipboard component for ios and android
 ```javascript
    import Clipboard from 'react-native'

    Clipboard.get((content)=>{
          console.log('here is content in clipboard:%s',content)
    });
    var content = 'here is a string';
    Clipboard.set(content);
```
Closes https://github.com/facebook/react-native/pull/4384

Reviewed By: svcscm

Differential Revision: D2738881

Pulled By: mkonicek

fb-gh-sync-id: a06df32d1eb2824cc9ca3de9d45e4e67fd2edbc9

ReactAndroid/src/main/java/com/facebook/react/modules/clipboard/ClipboardModule.java

@@ -0,0 +1,84 @@
+/**
+ * Copyright (c) 2015-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ */
+
+package com.facebook.react.modules.clipboard;
+
+import android.annotation.SuppressLint;
+import android.content.ClipboardManager;
+import android.content.ClipData;
+import android.os.Build;
+
+import com.facebook.common.logging.FLog;
+import com.facebook.react.bridge.Callback;
+import com.facebook.react.bridge.NativeModule;
+import com.facebook.react.bridge.ReactApplicationContext;
+import com.facebook.react.bridge.ReactContext;
+import com.facebook.react.bridge.ReactContextBaseJavaModule;
+import com.facebook.react.bridge.ReactMethod;
+import com.facebook.react.common.ReactConstants;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * A module that allows JS to get/set clipboard contents.
+ */
+public class ClipboardModule extends ReactContextBaseJavaModule {
+
+  public ClipboardModule(ReactApplicationContext reactContext) {
+    super(reactContext);
+  }
+
+  @Override
+  public String getName() {
+    return "Clipboard";
+  }
+
+  private ClipboardManager getClipboardService() {
+    ReactApplicationContext reactContext = getReactApplicationContext(); 
+    return (ClipboardManager) reactContext.getSystemService(reactContext.CLIPBOARD_SERVICE);
+  }
+
+  @ReactMethod
+  public void getString(Callback cb) {
+    try {
+      ClipboardManager clipboard = getClipboardService();
+      ClipData clipData = clipboard.getPrimaryClip();
+      if (clipData == null) {
+        cb.invoke("");
+        return;
+      }
+      if (clipData.getItemCount() >= 1) {
+        ClipData.Item firstItem = clipboard.getPrimaryClip().getItemAt(0);
+        String text = "" + firstItem.getText();
+        cb.invoke(text);
+      } else {
+        cb.invoke("");
+      }
+    } catch(Exception e) {
+      FLog.w(ReactConstants.TAG, "Cannot get clipboard contents: " + e.getMessage());
+    }
+  }
+
+  @SuppressLint("DeprecatedMethod")
+  @ReactMethod
+  public void setString(String text) {
+    ReactApplicationContext reactContext = getReactApplicationContext();
+    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
+      ClipData clipdata = ClipData.newPlainText(null, text);
+      ClipboardManager clipboard = getClipboardService();
+      clipboard.setPrimaryClip(clipdata);
+    } else {
+      ClipboardManager clipboard = getClipboardService();
+      clipboard.setText(text);
+    }
+  }
+}

ReactAndroid/src/main/java/com/facebook/react/shell/MainReactPackage.java

@@ -41,6 +41,7 @@ import com.facebook.react.views.toolbar.ReactToolbarManager;
 import com.facebook.react.views.view.ReactViewManager;
 import com.facebook.react.views.viewpager.ReactViewPagerManager;
 import com.facebook.react.views.swiperefresh.SwipeRefreshLayoutManager;
+import com.facebook.react.modules.clipboard.ClipboardModule;
 
 /**
  * Package defining basic modules and view managers.
@@ -51,6 +52,7 @@ public class MainReactPackage implements ReactPackage {
   public List<NativeModule> createNativeModules(ReactApplicationContext reactContext) {
     return Arrays.<NativeModule>asList(
       new AsyncStorageModule(reactContext),
+      new ClipboardModule(reactContext),
       new FrescoModule(reactContext),
       new IntentModule(reactContext),
       new LocationModule(reactContext),