added better IT tests for binary content

This partially addresses https://jira.duraspace.org/browse/FCREPO-1269

This commit added better IT tests for binaries and containers

It also adds much imporved integration tests with an external triplestore and an external Solr instance

renamed Namespaces class so as not to conflict with the o.a.c.builder.xml.Namespaces class

What remains for the JIRA issue is some OSGi testing.