Added RNFS and refactor image upload to use it

mobile/android/app/build.gradle

@@ -166,6 +166,7 @@ dependencies {
     compile 'com.amazonaws:aws-android-sdk-cognitoidentityprovider:2.2.+'
     compile project(':react-native-maps')
     compile project(':react-native-image-picker')
+    compile project(':react-native-fs')
 }
 
 // Run this once to be able to run the application with BUCK

mobile/android/app/src/main/java/com/deightonar/MainApplication.java

@@ -17,6 +17,8 @@ import com.airbnb.android.react.maps.MapsPackage;
 
 import com.imagepicker.ImagePickerPackage;
 
+import com.rnfs.RNFSPackage;
+
 public class MainApplication extends Application implements ReactApplication {
 
   private final ReactNativeHost mReactNativeHost = new ReactNativeHost(this) {
@@ -31,7 +33,8 @@ public class MainApplication extends Application implements ReactApplication {
           new MainReactPackage(),
           new ReactViroPackage(ReactViroPackage.ViroPlatform.GVR),
           new MapsPackage(),
-          new ImagePickerPackage()
+          new ImagePickerPackage(),
+          new RNFSPackage()
       );
     }