Update SemanticMediaWiki.php
Update RELEASE-NOTES.md
Catch exception in Special:WantedProperties for unknown predefined property
Merge pull request #282 from SemanticMediaWiki/exception

Catch exception in Special:WantedProperties for unknown predefined proper...
Catch exception in Special:WantedProperties for unknown predefined property
Merge pull request #288 from SemanticMediaWiki/exception

Catch exception in Special:WantedProperties for unknown predefined prope...
Create CONTRIBUTING.md

Adding information on how to contribute best to the SMW project
Update RELEASE-NOTES.md

Add note about issue https://github.com/SemanticMediaWiki/SemanticMediaWiki/issues/289
Update README.md

Add information about https://github.com/SemanticMediaWiki/SemanticMediaWiki/blob/master/CONTRIBUTING.md
Update CONTRIBUTING.md
Adjust test to cause fatal in DataRebuiler for SMWSparqlStore

Cause failure as reported by [0]

[0] http://wikimedia.7.x6.nabble.com/PHP-Fatal-error-php-rebuildData-php-p-tp5026625.html
Fix Call to undefined method SMWSparqlStore::getDatabase
Merge pull request #291 from SemanticMediaWiki/bug-datarebuilder-sparqlstore

Fix Call to undefined method SMWSparqlStore::getDatabase
Update RELEASE-NOTES.md
Merge branch 'master' of ssh://wmfgerrit/mediawiki/extensions/SemanticMediaWiki