Improve spec_helper and add pry to Gemfile

Gemfile

@@ -4,6 +4,7 @@ source "http://rubygems.org"
 gemspec
 
 gem 'rake'
+gem 'pry'
 
 require 'rbconfig'
 

spec/spec_helper.rb

@@ -3,9 +3,10 @@
 
 RSpec.configure do |config|
 
-  config.color_enabled = true
-  config.filter_run :focus => true
+  config.treat_symbols_as_metadata_keys_with_true_values = true
   config.run_all_when_everything_filtered = true
+  config.color_enabled = true
+  config.filter_run :focus
 
   config.before(:each) do
     ENV['GUARD_ENV'] = 'test'