Moderation

Some moderation commands, still on process..

List of commands:

Command	Description
g#ban	Bans a tagged member
g#unban	Unbans a member
g#kick	Kicks a tagged member
g#prune	Delete up to 100 messages
g#addrole	Add a role to an user
g#removerole	Remove a role from an user+
g#nickname	Change the nickname of an User
g#strawpoll	Make a strawpoll link!
g#welcome	sets welcome message and channel. Use false to disable and $member to mention the new member!