Fix docstring [#156]

Thanks, @rdallasgray
Fix customization group and type
Really skip Scala on Travis
Properly skip JRuby tests as well
Document all test helpers
[Fix #157] Add support for Web Mode

`html-tidy` now checks in Web Mode as well.
Merge pull request #157 from lunaryorn/support-web-mode

Support using html-tidy check for web-mode