Fix udp config example missed parameter

Added the parameter osc.listening.port to the udp config example.
Without that parameter the java desktop gui doesn't initialize the main
window, showing a white panel.
Merge pull request #32 from gpulido/master

Missing parameter on udp config example makes application to not show correctly the main window
Merge branch 'master' of github.com:neophob/PixelController into develop