Allow / in nicknames

Original patch from martynsmith#527

Author: zordtk

lib/parse_message.js

@@ -23,7 +23,7 @@ module.exports = function parseMessage(line, stripColors) {
     if (match) {
         message.prefix = match[1];
         line = line.replace(/^:[^ ]+ +/, '');
-        match = message.prefix.match(/^([_a-zA-Z0-9\~\[\]\\`^{}|-]*)(!([^@]+)@(.*))?$/);
+        match = message.prefix.match(/^([_a-zA-Z0-9\~\[\]\\\/`^{}|-]*)(!([^@]+)@(.*))?$/);
         if (match) {
             message.nick = match[1];
             message.user = match[3];