removes the leading character on a NICK message, only if it's a : to deal with non-conforming IRCd's
fixing stylistic stuff on ~alias. should close reality/depressionbot#295
give users module proper usage info, subsequently fix empty params erroring
supress error on joining channel, due to dbot attempting to get info on own join
Merge pull request #318 from JohnMaguire2013/users

fixes the issue where users are not tracked correctly on some IRCd's