Improved Enqueuing and Caching

Changed enqueuing action to wp_enqueue_scripts for proper queuing, added priority '50' to ensure user stylesheets have priority over other theme or wordpress stylesheets.

Changed error style action to wp_print_styles.

Added unlink to delete cache files after successful write. This will prevent old or deleted files from being re-added to the css folder.

Updated version to 1.0.0 for official release.