update readme to use phonegap-webos instead of phonegap-palm
update readme to use phonegap-webos instead of phonegap-palm

apache/cordova-webos,apache/cordova-webos,surajpindoria/cordova-webos,hermwong/incubator-cordova-webos-tests,hermwong/incubator-cordova-webos,surajpindoria/cordova-webos