* API Change: Sitemaps are now generated using a block syntax. Find methods are no longer the responsibility of BigSitemap. Instead, sitemaps are generated using a block, in which you call your own find methods, passing the results to BigSitemap with the 'add' method. See the README for details.
* BigSitemapRails and BigSitemapMerb are now BigSitemap::Rails and BigSitemap::Merb, respectively.
* Sitemap files are now placed in the document root by default
* Sitemaps are now automatically cleaned before generating the new set
* Search engines are now pinged automatically when the sitemap is generated
* Lock files are now generated automatically
* Sitemap files are no longer split amongst your models