Update SemanticMediaWiki.php
1.9.2 release
Fix undefined index in DataTypeRegistry::getDefaultDataItemTypeId
Merge pull request #279 from SemanticMediaWiki/datatype-registry

Fix undefined index in DataTypeRegistry::getDefaultDataItemTypeId
Update RELEASE-NOTES-1.9.2.md
Merge branch 'master' of ssh://wmfgerrit/mediawiki/extensions/SemanticMediaWiki