Adding support for custom posts

The search includes all post types, except when searching by post content, in which case it only considers pages and posts.

In order to make search by post content work with all post types, change line 7 of searches/post_content.php

from
$sql = "SELECT ID, post_content, post_title FROM {$wpdb->posts} WHERE post_status != 'inherit' AND post_type IN ('post','page') ORDER BY ID ".$orderby;

to
$sql = "SELECT ID, post_content, post_title FROM {$wpdb->posts} WHERE post_status != 'inherit' ORDER BY ID ".$orderby;