Remove hacks for comments in WMS capabilities.

This functionality is now present in TranslatorSupport, which also
fixes comment when used in inner elements - a comment was misplaced
when used in this way before.
Merge pull request #233 from martin-sucha/fix-comments-hack

Remove hacks for comments in WMS capabilities.
Merge branch 'master' of git://github.com/geoserver/geoserver