Add HTML5 'main' tag to list of block level declarations

git-svn-id: http://textpattern.googlecode.com/svn/development/4.x@5125 2fea6a4d-a838-0410-917b-93a53c48e9d2
jQuery v1.9.0 w/ jQuery Migrate v1.0.0

git-svn-id: http://textpattern.googlecode.com/svn/development/4.x@5126 2fea6a4d-a838-0410-917b-93a53c48e9d2