Complete porting of theme setup functions into FSESU_Theme class

Added favicon function to enforce the use of a local favicon.ico file for the site (this will obviously only work if the favicon.ico file actually exists within the themes root directory)
Cloned normalize.css from https://github.com/necolas/normalize.css as a better reset/html5 stylesheet setup for the site
Adjusted the styles function to include normalize.css as the first style enqueued
Added the Lato Google Font to the styles function for use throughout the theme
Added filters for changing the excerpt length, changing the 'more' link in the excerpt and removing the automatic paragraph wrapper around images
Added categories function for use by the functions.php file to register the site specific categories