Added bzip2 support

Hello there! So i just made added support for bzip2! I tried it myself and it has been tested mutliple times. Its working flawlessly. This might not look like it is much, but i spend an hour figuring out where and how to add the support for bzip2. At the end of the day it is working. If something that isnt suitable for http_get.c that i changed let me know!