Follow-up on 450

- Add SearchInPageDBIntegrationTest
- `testSearchForGeographicCoordinateValueAsTerm` needs Semantic Maps will fail for the SPARQLStore
- Minor Search clean-up
- Throw exception in case 'smwgFallbackSearchType' contains a invalid class
Merge pull request #496 from SemanticMediaWiki/follow-up-450

Follow-up on #450 / Add integration tests and clean-up