- Theme system updates: theme() function return their data now.

Updating to 4.3.0 functionality.  This module adds breadcrumbs for url aliases and doesn't interfere with drupal's core breadcrumb system.

- Created new function breadcrumb_get to be the main API.  Returns an array of the navigation trail.  I did this to match the functionality of Drupal's new breadcrumb system.  This allows the theme_breadcrumb function to receive data from either source.
- Modified menu and data retrieval mechanisms due to underlying Drupal changes.
- Added xtemplate and marvin examples for theme integration with this module

Bug Fix: don't display the breadcrumb trail when path is null, or viewing the photo gallery or a taxonomy