Adds the class panel-title to headers (H1, H2, H3, etc) for all panel headers for pages.

Purely an aesthetic change so that pages are not quite so long vertically. If it's terrible we can revert it.
Merge pull request #63 from scottelundgren/panel-title

Adds the class panel-title to headers (H1, H2, H3, etc) for all panel he...