Support for saving images

[maeriil]

In the imagetranslation.py file, we currently support file saving like this:

    if save_image:
        directory = "results/"
        if not os.path.exists(directory):
            os.makedirs(directory)
        name = "translated_image.png"

        cv2.imwrite(os.path.join(directory, name), destination_image)

We want to add following support as well.

• Support for saving images to custom path location. The location will be an optional parameter in the main function translate. Default path will be results/. Error handling should be added for this setup.
• Support for saving images in different image format. The format will be an optional parameter in the main function translate. Default format will be .png. Error handling should be added for this setup.
• Support for saving images in different file name. The format will be an optional parameter in the main function translate. Default name will be translated_image