User; explicitly lower channel names

	modified:   lib/IRC/Server/Toolkit/User.pm
add Channel::PresentUser objs

	modified:   lib/IRC/Server/Toolkit/Channel.pm
	new file:   lib/IRC/Server/Toolkit/Channel/PresentUser.pm
User shouldn't ->lower

Channels don't really need to be lowered; creation name sticks around

	modified:   lib/IRC/Server/Toolkit/User.pm
cleanups, TODO