Allow usage of bin/rspec ./*/spec --only-failures

.gitignore

@@ -95,3 +95,6 @@ Gemfile.lock
 
 #byebug_history
 .byebug_history
+
+# rspec failures
+.rspec_failures

core/spec/features/refinery/core_spec.rb

@@ -1,12 +1,14 @@
+require "spec_helper"
+
 module Refinery
   module Core
     describe Engine, :type => :feature do
       describe "#refinery_inclusion!" do
         it "should be idempotent" do
-          expect { visit(refinery.root_path) }.to_not raise_error
+          expect { visit(refinery.root_path) }.not_to raise_error
           Engine.refinery_inclusion!
           Engine.refinery_inclusion!
-          expect { visit(refinery.root_path) }.to_not raise_error
+          expect { visit(refinery.root_path) }.not_to raise_error
         end
       end
     end

spec/spec_helper.rb

@@ -49,6 +49,9 @@
       activerecord dragonfly benchmark quiet_assets rubygems
     ).map { |noisy| /\b#{noisy}\b/ }
   end
+
+  # Store last errors so we can run rspec with --only-failures
+  config.example_status_persistence_file_path = ".rspec_failures"
 end
 
 # Requires supporting files with custom matchers and macros, etc,