Improve type hint
Update README.md
Update README.md
Tweak some tests

Change-Id: Ie708e146f9ba8321555a40c56ef82cea2e0813ea
Merge pull request #129 from SemanticMediaWiki/tests

Tweak some tests
Update SMW_LanguageDe.php

Adding special property "query duration"
Update SMW_LanguageAr.php

Adding special property "query duration"
Update SMW_LanguageArz.php

Adding special property "query duration"
Update SMW_LanguageCa.php

Adding special property "query duration"
Update SMW_LanguageEs.php

Adding special property "query duration"
Update SMW_LanguageFi.php

Adding special property "query duration"
Update SMW_LanguageFr.php

Adding special property "query duration"
Update SMW_LanguageHe.php

Adding special property "query duration"
Update SMW_LanguageId.php

Adding special property "query duration"
Update SMW_LanguageIt.php

Adding special property "query duration"
Update SMW_LanguageNl.php

Adding special property "query duration"
Update SMW_LanguageNo.php

Adding special property "query duration"
Update SMW_LanguagePl.php

Adding special property "query duration"
Update SMW_LanguagePt.php

Adding special property "query duration"
Update SMW_LanguageRu.php

Adding special property "query duration"