Add a blink comparator and pixel difference to image diffs

Tom

2014-11-17 b6f47539cd1a1dafe05ffd6fdc40bce4547c479d

 src/main/java/log4j.properties

@@ -25,7 +25,9 @@
#log4j.logger.net=INFO

#log4j.logger.com.gitblit=DEBUG
log4j.logger.org.apache.sshd=ERROR
log4j.logger.com.gitblit.transport.ssh.SshServerSession=WARN
log4j.logger.org.apache.sshd=WARN
log4j.logger.org.apache.mina=WARN

log4j.logger.org.apache.wicket=INFO
log4j.logger.org.apache.wicket.RequestListenerInterface=WARN