Fixed the following issues:

http://drupal.org/node/291884 (file_get_contents error)
http://drupal.org/node/254519 (address being deleted/updated based on google's geocoding information)
http://drupal.org/node/218465 (revisions support)
http://drupal.org/node/216683 (price is no longer required)
http://drupal.org/node/211063 (disabled map specific search fields when the map module is disabled)
http://drupal.org/node/211057 (removed viewer_xml.php and incorporated the code into the module)