Added tmp/sessions, tmp/cache, and tmp/sockets as default directories in the Rails skeleton [DHH] Changed the default session configuration to place sessions in tmp/sessions, if that directory is available, instead of /tmp (this essentially means a goodbye to 9/10 White Screen of Death errors and should have web hosting firms around the world cheering) [DHH] Added a default configuration of the FileStore for fragment caching if tmp/cache is available, which makes action/fragment caching ready to use out of the box with no additional configuration [DHH] Changed the default configuration for lighttpd to use tmp/sockets instead of log/ for the FastCGI sockets [DHH]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@3645 5ecf4fe2-1ee6-0310-87b1-e25e094e27de