Added fixtures :all to test_helper.rb to assume that most people just want all their fixtures loaded all the time [DHH] Added fixtures :all as a way of loading all fixtures in the fixture directory at once (closes #7214) [manfred]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@6227 5ecf4fe2-1ee6-0310-87b1-e25e094e27de