moves all the checks in `/inc/load-options.php` to separate functions and handled by a template tag

this avoids using an include in template files
implements new functions/template tags in template files
bumped version and added notes to readme
* Removed `function_exists` checks for pre-3.4 functions
* Moved `wp_head` directly above `</head>`
* Moved `wp_footer` directly above '</body>'
prefixed everything
notes
fixes nav walker class name and escapes home_url
escapes home_url
set default navbar background to transparent