Move onPersonalUrls to SWL\MediaWiki\Hooks\PersonalUrls

Unaltered functionality + test
Move onUserSaveOptions to SWL\MediaWiki\Hooks\UserSaveOptions
Move onSchemaUpdate to SWL\MediaWiki\Hooks\ExtensionSchemaUpdater
Move onGetPreferences to \SWL\MediaWiki\Hooks\GetPreferences
Merge pull request #12 from SemanticMediaWiki/hooks

Move hooks to allow proper unit tests