Discord Bot API Compliance

As Discord nears an initial bot API, there are guidelines and rules being set in place by the developers of how bots should work with the official API. This page is to show the current compliance of discord.js with the new rules:

• user agent API data - since 1a93f86
• token caching to reduce login requests - since 8f85048
• built-in rate limiting - since da990f5
• mention changes - since 90045db