Update match_json_response matcher to show full expected and actual

Author: Brian Butz

spec/support/matchers/match_json_response.rb

@@ -44,6 +44,7 @@
 
     result = []
     if !summary.empty?
+      result << "Expected:\n#{JSON.pretty_generate(expected)}\nto equal:\n#{JSON.pretty_generate(actual)}\n"
       result << "Summary:\n#{summary.map { |s| '      ' + s }.join("\n")}\n"
     end
     if exception