Wrapping table headers in a thead tag (more standards-compliant, and easy jQuery dataTables integration)
Remove Ruby 1.8.7 from Travis test list

Don't need to support ancient Ruby any more.
Merge pull request #31 from dverrier/master

Tests ported to minitest with Ruby 1.9.3p547
Merge pull request #27 from sergiokas/master

Wrapping HTML table headers in a <thead> tag