Fixes#63. Multi-server support allows you to set an array of ids in
mainGuildId. If there are more than 1 main guild, the thread header will
display nickname and join date for each main guild the user is in.
Thread header information now also includes how long it's been since the
user joined the guild(s).
The commit also includes some minor code cleanup.
A thread can be scheduled to be closed by adding a time parameter to
the !close command. For example, !close 2m would automatically close
the thread in 2 minutes. The actual scheduling is implemented with a
loop that runs every 2 seconds, checking for threads that should be
closed.
Dragory
HaydenMeloche