Don't ignore files in test resource directories anymore
Pass XHTML content to parsers instead of file names

This will make testing the parsers a lot easier.
Add tests for XhtmlConverter

Woohoo, the first tests!
Remove unused files in test resources
Small refeactoring

- remove unnecessary parenthesis
- remove unnecessary named value
Don't store retrieved report files in test resources

They may overwrite the ones used in tests.