Handle the LIST message

This library should be able to handle the LIST message so it will be possible to get a list of channels on a given irc server. The LIST command is described in the IRC spec here: https://tools.ietf.org/html/rfc2812#section-3.2.6

I did notice the spec doesn't mention anything about commands commonly found in IRC clients such as /list <50 to get all channels with more than 50 participants. Are we going to stick to the spec or add in these custom features?

Found an answer to my own question: these custom parameters such as /list >500 are handled server-side by the irc servers themselves. When I run a LIST >500 on freenode they'll return the list of channels with more than 500 members. No need to add those features ourselves.