Tidy up SpecialPageTestCase

- Add @group SpecialPage
- Derive from PHPUnit_Framework_TestCase
- Ensure to clean-up the ob level
Tidy up SpecialPageTestCase

- Add @group SpecialPage
- Derive from PHPUnit_Framework_TestCase
- Ensure to clean-up the ob level
Merge pull request #137 from SemanticMediaWiki/tests

Tidy up SpecialPageTestCase