fix validation issues by using the right xsd versions
implement mock log appender as an slf4j binding
convert log4j.logger properties into mocklogger properties
reset to default or DEBUG, not TRACE
never use 0 directly
fix test
set log prefix in event listeners
print to STDOUT rather than STDERR, also add some defaults from log4j.properties
Merge remote-tracking branch 'origin/master' into features/clustering