Remove shared functionality that now exists in refinerycms-testing engine

lib/gemspec.rb

@@ -5,6 +5,9 @@ raise "Could not get version so gemspec can not be built" if version.nil?
 files = Dir.glob("**/*").flatten.reject{|f| f =~ %r{.gem$}}
 
 gemspec = <<EOF
+# Encoding: UTF-8
+# DO NOT EDIT THIS FILE DIRECTLY! Instead, use lib/gemspec.rb to generate it.
+
 Gem::Specification.new do |s|
   s.name              = %q{refinerycms-blog}
   s.version           = %q{#{version}}
@@ -23,7 +26,7 @@ Gem::Specification.new do |s|
   s.add_dependency    'seo_meta',           '~> 1.1.0'
 
   # Development dependencies
-  s.add_development_dependency 'factory_girl'
+  s.add_development_dependency 'refinerycms-testing', '~> 1.1.0'
 
   s.files             = %w(
     #{files.join("\n    ")}