Old test result files are deleted prior to running a new test.
Moved code for deleting old test files to test runner class.
Added missing collecting of new available titlings in freshly imported titlings.
Resolving issues #20 and #23
Resolving issue #15
Added Relax NG validation and processing of xml include directives and xml catalogs.
Added some todos for integration into OntoMaven.
Merge pull request #18 from ag-csw/master

issue #12