catch 0.8.5 crash: race between doConnect and unRegisterCallback
proguard: do not remove jzlib
roster: show JID in context menu
updated README with build instructions, thanks klnikita
update SMACK library: smack with xep0280 and xep0184

Using smack/master from 2013-02-05:
b1b1bc61829c646690e3d24c83515fd07c21dda0
replace local ping impl with smackx
replace own XEP-0280 code with smack's
xep-0280: add preferences option
do not send receipts for CCed messages
roster fetch on connect: 1/2
roster fetch on connect: 2/2, bulk inserts
change ping transmission, make it public
send ping on wifi reconnect
ACTION_SEND: use MainWindow UI instead of custom
new contact dialog: scroll in landscape
fix server ping on CONNECTIVITY_CHANGE event

 * return after sending ping, this prevents a reconnect each time
 * better debugging
 * do not start a connection if not demanded
pinger: only send once until last one returns
disable compression due to strange bugs. see #85
XEP-0184: use smack's new DeliveryReceiptManager
translations import from launchpad.net