Update spec/support/matchers.rb

Rubinius does not yet destructure block (or method) arguments in 1.9 mode. This change makes the specs pass on Rubinius. It's not clear to me why destructering is being used here. Ruby will already destructure a single Array-ish argument into separate block argument locals. In this case, unless you want, give `a, b` passed, `name, content = a` and NOT `name, content = a, b`, the unparenthesized (ie non-extra-level-destructuring) should work fine. If that makes any sense. :)

spec/support/matchers.rb

@@ -26,7 +26,7 @@ end
 
 RSpec::Matchers.define :deliver_result_image_for do |name|
   match do |response|
-    actual = files.detect do |(name, content)|
+    actual = files.detect do |name, content|
       response.body.to_s.force_encoding('ascii') == content.to_s.force_encoding('ascii') # TODO ummmmmmmm?
     end
     actual = actual && actual[0]