Fixed that each request with the WEBrick adapter would open a new database connection #1685 [Sam Stephenson]. Added ActiveRecord::Base.threaded_connections flag to turn off 1-connection per thread (required for thread safety). By default it's on, but WEBrick in Rails need it off #1685 [Sam Stephenson]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@1792 5ecf4fe2-1ee6-0310-87b1-e25e094e27de