Merge branch 'master' into reinstate-modernizr
revert PR #258 which got rid of Modernizr. One thing Modernizr does is make HTML5 section elements (<nav>, <section>, et al.) behave as expected in IE. Removing Modernizr changed the rendering in IE8. Needs more review/discussion.
Merge pull request #259 from Trott/reinstate-modernizr

Reinstate modernizr
replace Modernizr with html5shiv
Merge pull request #261 from Trott/re-remove-modernizr

replace Modernizr with html5shiv