Added new SuluTestCase for WebTests

- Extends SymfonyCMF Testing component
Added purgeDatabase method and comments
Added some default structure templates
Merge pull request #25 from sulu-cmf/enhancement/faster-testing

Added new SuluTestCase for WebTests
Updated composer
Updated composer
Merge branch 'develop' of git://github.com/sulu-cmf/SuluTestBundle into feature/snippets