add support for genesis theme framework
add site title on feed pages
add function docs
add comment author markup
only load genesis.php if genesis is active
Readme typo
fix genesis support

we can't call genesis_html5 from within uf2, since the plugin is
apparently loaded before the theme.  Instead, we move uf2_genesis_init
into the main uf2.php file, and then include genesis.php when needed.
only load genesis.php if genesis is active