Discord.aio

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* Updated to discord api v8

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* Fixed async error when closing bot using ctrl-c

* Added Channelsend_message
* Added Channelmention
* Added Channeltyping
* Added Channeldelete
* Added Channelupdate
* Added Channelrefresh
* Added Channelget_message
* Added ChannelMessagedelete_own_reaction
* Added ChannelMessagedelete_user_reaction
* Added ChannelMessagedelete_all_reactions
* Added ChannelMessageget_reactions
* Added ChannelMessageupdate
* Added ChannelMessagedelete
* Added ChannelMessagebulk_delete_messages
* Added ChannelMessageget_invites
* Added ChannelMessagecreate_invite
* Added ChannelMessagedelete_permission
* Added ChannelMessageget_pinned_messages
* Added ChannelMessagepin_message
* Added ChannelMessagedelete_pinned_message

* Moved DiscordBotget_messages to Channelget_messages
* Moved DiscordBotleave_guild to Guildleave
* Moved DiscordBotget_guild_member to Guildget_member
* Moved DiscordBotget_guild_members to Guildget_members
* Moved DiscordBotcreate_guild_channel to Guildcreate_channel
* Moved DiscordBotdelete_guild to Guilddelete
* Moved DiscordBotget_guild_channels to Guildget_channels
* Moved DiscordBotmodify_channel to Channelupdate

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* Added DiscordBot.get_guild_channels method
* Added DiscordBot.create_guild_channel method
* Added DiscordBot.delete_guild method
* Added DiscordBot.move_channels method
* Added NotFoundError exception
* Added GatewayUnavailable exception
* Added BadRequestError exception
* Added AuthorizationError exception
* Fixed a bug in websocket

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* All discord events can be used now.

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* Initial development version