config: added heap size to surefire to fix travis failures #4487
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Test to fix Issue #4316
Sources for fix:
travis-ci/travis-ci#5631 (comment)
travis-ci/travis-ci#6330 (comment)
https://stackoverflow.com/questions/23260057/the-forked-vm-terminated-without-saying-properly-goodbye-vm-crash-or-system-exi
https://issues.apache.org/jira/browse/STORM-1436