CB-12964: (android) Fix of bug when Pictures folder did not exist.

If someone had removed Pictures folder in android, plugin failed trying to move there the new photo. This happened because plugin did not check the existence of this folder, and if not, it did not complete the folder tree.

This closes #273

src/android/CameraLauncher.java

@@ -601,6 +601,7 @@ public class CameraLauncher extends CordovaPlugin implements MediaScannerConnect
         String imageFileName = "IMG_" + timeStamp + (this.encodingType == JPEG ? ".jpg" : ".png");
         File storageDir = Environment.getExternalStoragePublicDirectory(
                 Environment.DIRECTORY_PICTURES);
+        storageDir.mkdirs();
         String galleryPath = storageDir.getAbsolutePath() + "/" + imageFileName;
         return galleryPath;
     }