Merging 1.3.0-beta1 back into develop
Merge of final 1.3.0 branch
Update required attribute to XHTML spec. Fixes #72
Added new donor
Replace genesis-html5 with html5. Fixes #73
Update html5 theme supports. Fixes #73 Fixes #75
Bump version to 1.3.1. Fixes #74. Tested on 3.6. Fixes #60
Updated changelog. Fixes #76
1.3.1