Changes made to HTML code to clear validation errors.
<file name>: <changes>

_title_bar: changed nav to div in order to use role="menu" and keep sub vie roles in place
_header: removed group tag (not needed) and " clear='all' " attribute from br tag (not allowed)
show: changed hgroup to div
new: removed type="textarea" and autocomplete="on" from textarea (not applicable to tag);  changed email label attribute for="email_addr" to for="email" to match input id
Merge pull request #209 from uclibs/feature/124_html5_validation_fix

Changes made to HTML code to clear validation errors.