Build: Include test folder in dist branches

Fixes gh-1631
Fixes width of legend underline in IE9
Merge pull request #1665 from pjackson28/v3.0

 Added working examples for form validation of checkbox and radio button groups.
Merge pull request #1664 from patheard/ie9-legend-border

Fixes width of legend underline in IE9
Removed overflow:hidden from checkbox and input
Merge pull request #1669 from cfarquharson/v3.0

Removed overflow:hidden from checkbox and input
Changed #embedded and #toc example links into placeholder ones (#).
Re-added an accidentally-changed #toc link.
Merge pull request #1686 from EricDunsworth/v3.0-broken-link-fixes

Grids placeholder links
Merge pull request #1632 from nschonni/add-responsive-to-dist-branches

Build: Include test folder in dist branches
Fixed double nav-current issue in #1722.