[commands] Add support for IDs in the role related checks.
[commands] Add support for IDs in the role related checks.

This affects:

* commands.has_role
* commands.has_any_role
* commands.bot_has_role
* commands.bot_has_any_role

imayhaveborkedit/discord.py,Harmon758/discord.py,Rapptz/discord.py,rapptz/discord.py,khazhyk/discord.py,Harmon758/discord.py