Merge pull request #158 from Atheros1/master

fix bug that caused workerThread to crash when sending out an old v2 pubkey
Merge pull request #159 from Atheros1/master

update defaultKnownNodes.py
Merge pull request #160 from Atheros1/master

Prevent incoming connection flooding from crashing singleListener thread
Merge branch 'master' of github.com:Bitmessage/PyBitmessage
New tray icon, also use existing local-IP rejection function for received addr messages also