Move DEFAULT_OPTS for rake/spec to .rspec

Also properly define the "all" case.
Cut number of integration failures in half

On ruby 1.9.3-p547, for 'rake rspec_with_integration'
Was: 120 examples, 90 failures, 1 pending
Now: 120 examples, 45 failures, 1 pending

The errors fixed were of the form:
NoMethodError:
  undefined method `visit' for #<RSpec::ExampleGroups::ItemEdit:0x007fe082ba3a28>