Add support for WooCommerce Pretty Email in WooCommerce 2.1.

// woocommerce/includes/wc-core-functions.php
// Locate wc_get_template function and add this two lines, line 102 like in the exemple above
// // Allow 3rd party plugin filter template file from their plugin
// $located = apply_filters( 'wc_get_template', $located, $template_name, $args, $template_path, $default_path );

function wc_get_template( $template_name, $args = array(), $template_path = '', $default_path = '' ) {
    if ( $args && is_array( $args ) ) {
        extract( $args );
    }

    $located = wc_locate_template( $template_name, $template_path, $default_path );

    if ( ! file_exists( $located ) ) {
        _doing_it_wrong( __FUNCTION__, sprintf( '<code>%s</code> does not exist.', $located ), '2.1' );
        return;
    }

    // Allow 3rd party plugin filter template file from their plugin
    $located = apply_filters( 'wc_get_template', $located, $template_name, $args, $template_path, $default_path );

    do_action( 'woocommerce_before_template_part', $template_name, $template_path, $located, $args );

    include( $located );

    do_action( 'woocommerce_after_template_part', $template_name, $template_path, $located, $args );
}