Remove unused SampleFacts.createAll
Remove unused testDir vals in specs
Remove unneeded calls to createEntitiesFiles in a few specs
Move createEntitiesFiles to ChordSpec
Introduce a simple RepositoryBuilder and cleanup a few specs
Merge pull request #235 from ambiata/topic/repository-builder-minor-cleanup

Topic/repository builder minor cleanup
Fix Rename comment about writing out feature, not namespace
Issue #238: Fix Rename bug due on entity/time clashes
Rename FeatureMappingValue ns to featureId
Add mr tag to relevant Rename specs