README, README_zh-tw:
add PircBotX version info

IRCBot.scala:
temporarily disable PircBotX.logException()
UserColorMapper.java:
a Mapper that maps username to color

IRCBot.scala:
send "JTVCLIENT" when connecting to a jtv irc server
save USERCOLOR when getting any

MessageIcon.scala:
change var name (for future change)

InputThread.java:
remove a debug println statement
disable using ttv nickname option
bevause this option is no longer available on ttv

IRCUser.scala:
def nickname always return username of ttv
(this change disables using ttv nickname)

AvatarWindow.scala:
remove cusing ttv nickname heckbox

Preferences.scala:
remove preference relating to using ttv nickname

all codes are commentted out rather than actually removed for
future reference