Tidy some tests

- Added StoreFactory::setDefaultStoreForUnitTest to set a mock instance during testing
- ConceptParserFunctionTest extends \PHPUnit_Framework_TestCase
- SemanticDataTest extends \PHPUnit_Framework_TestCase
- SimpleQueryResultQueryProcessorIntegrationTest extends \PHPUnit_Framework_TestCase
- StoreFactoryTest
- AskArgsTest
- BrowseBySubjectTest
- InfoTest
Merge pull request #340 from SemanticMediaWiki/fuseki-test-tidy

Tidy some tests