1. the code is rewritten as a class to make it easier to use with a proxy.
2. the VQD_CACHE is deleted pending clarification because vqd's for some reason changes.
3. ddg, ddg_images, ddg_videos, ddg_news, ddg_answers, ddg_suggestions, ddg_translate, ddg_maps functions are now deprecated. They will be removed in the future.
4. output and download parameters were removed from the functions and the functionality was moved to the CLI module.
5. issue templates added.