GITHUB : bump owlapi versions to 3.4.3.1-ansell

add .gitignore

add slf4j-api dependency

add metainf-services dependency

add sesame dependencies

add commons-io test dependency to contract

avoid depending on junit and mockito in pom.xml by using dependencyManagement
GITHUB : switch the URL in the generated by message to this github fork
GITHUB : Use maven properties file to fetch the current version

avoid synchronising static method for singleton creation