Added support for cardinality detection.

4 jobs for master in 22 minutes and 57 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
passed #710
jars-j8

00:00:31

passed #709
java8

00:11:23

 
  Test
passed #711
java7

00:10:50

failed #712
allowed to fail
java9

00:00:12

 
Name Stage Failure
failed
java9 Test There is an unknown failure, please try again
	at java.base/sun.security.validator.PKIXValidator.<init>(PKIXValidator.java:86)
... 72 more
2624 [ERROR]
2624 [ERROR] Re-run Maven using the -X switch to enable full debug logging.
2624 [ERROR]
2624 [ERROR] For more information about the errors and possible solutions, please read the following articles:
2625 [ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/ProjectBuildingException
2625 [ERROR] [Help 2] http://cwiki.apache.org/confluence/display/MAVEN/UnresolvableModelException
ERROR: Job failed: exit code 1