memoization of _view in helper and view specs. - see http://github.com/rails/rails/commit/bdcf70cca89df906a3510464ef46a44646fd29a3 Related to #72 and #73.
- overrides _view to add memoization (should push that to rails) Closes #73.
- With rspec-rails configured in the :test group in the Gemfile, the rspec-rails railtie doesn't get loaded by default. This means that rails generators don't see that rspec is the testing framework unless it is explicitly set somewhere in the user's app.
… faster, but might be brittle down the road)
- speeds rspec-rails' own cukes from 2m36s to 30s
spec_helper sets it to true