Change repo url to roots org

Ref: roots/grunt-wp-version#1
Rename task from wprev to version
Contributing
Refactor task

Change task name from wprev to version

Roots work perfectly when querystring enable but useless when querystring disable.

wp_enqueue_style( $handle, $src, $deps, $ver, $media );
wp_register_script( $handle, $src, $deps, $ver, $in_footer );

Roots default set for wp_enqueue_style ($media) and wp_register_script ($in_footer)

Fixed roots/grunt-wp-version#1