Refactor HTTP requests to be asynchronous

[ElijahKSmith]

Been reading a bunch about HTTP requests in Python and learned that the current use of the Requests library is blocking. While there are no current plans to host the bot in such a way that it would be used on multiple servers to actually see the effects of these blocking calls it's still bad practice. Therefore the requests will be refactored in one of the following ways or another if I find an easier way to do so:

• AIOHTTP, already included with Discord.py
• ross/requests-futures
• spyoungtech/grequests

EDIT: See https://hackernoon.com/how-to-run-asynchronous-web-requests-in-parallel-with-python-3-5-without-aiohttp-264dc0f8546

[ElijahKSmith]

Either grequests or AIOHTTP uses a monkey-patched version of ssl.py so grequests is out.