Add OWASP dependency check to build

Please add OWASP Dependency Check to the build (pom.xml). OWASP DC makes an outbound REST call to MITRE Common Vulnerabilities & Exposures (CVE) to perform a lookup for each dependant .jar to list any/all known vulnerabilities for each jar. This step is needed because a manual MITRE CVE lookup/check on the main component does not include checking for vulnerabilities in components or in dependant libraries.

OWASP Dependency check : https://www.owasp.org/index.php/OWASP_Dependency_Check has plug-ins for most Java build/make types (ant, maven, ivy, gradle).

We should make the check optional, by placing it in a Maven profile, that is not executed by default. We should, however, modify our builds (at least the nightlies, but I'd consider doing this for Travis too) to enable the profile.