Quick register post type function from @rilwis (http://www.deluxeblogtips.com/2012/05/register-custom-post-type.html)

functions.php

<?php

function _register_post_type( $post_type = '', $args = array() ) {
    if ( empty( $post_type ) )
        return;
    $singular = empty( $args['singular'] ) ? $post_type : $args['singular'];
    $singular = str_replace( '_', ' ', $singular );
    $singular = ucwords( $singular );
    $plural = empty( $args['plural'] ) ? "{$singular}s" : $args['plural'];
    $plural = ucwords( $plural );
    $plural_lower = strtolower( $plural );
    $args['labels'] = empty( $args['labels'] ) ? array() : $args['labels'];
    $args['labels'] = wp_parse_args( $args['labels'], array(
        'name'               => $plural,
        'singular_name'      => $singular,
        'add_new'            => __( 'Add New', 'your_textdomain' ),
        'add_new_item'       => sprintf( __( 'Add New %s', 'your_textdomain' ), $singular ),
        'edit_item'          => sprintf( __( 'Edit %s', 'your_textdomain' ), $singular ),
        'new_item'           => sprintf( __( 'New %s', 'your_textdomain' ), $singular ),
        'view_item'          => sprintf( __( 'View %s', 'your_textdomain' ), $singular ),
        'search_items'       => sprintf( __( 'Search %s', 'your_textdomain' ), $plural ),
        'not_found'          => sprintf( __( 'No %s found', 'your_textdomain' ), $plural_lower ),
        'not_found_in_trash' => sprintf( __( 'No %s found in Trash', 'your_textdomain' ), $plural_lower ),
        'parent_item_colon'  => null,
        'all_items'          => sprintf( __( 'All %s', 'your_textdomain' ), $plural ),
        'menu_name'          => $plural,
    ) );
    $args = wp_parse_args( $args, array(
        'public' => true,
    ) );
    register_post_type( $post_type, $args );
}