add test file for checking repository
add basic travis-ci testing yaml
less verbose .travis.yml
ensure graphviz is installed before building in travis
generate pregelix test .xml files for travis; full pregelix suite tested
log errors in testing and stop printing the graphviz output
stop printing from graphviz and test cases
travis: remove jdk6; add full content of surefire reports to log
change all Vkmer* test "print" to "Assert"