add color output + make default

lib/inspec/runner_rspec.rb

@@ -76,6 +76,7 @@ module Inspec
     # @return [nil]
     def configure_output
       RSpec.configuration.add_formatter(@conf['format'] || 'progress')
+      RSpec.configuration.color = @conf['color']
 
       setup_reporting if @conf['report']
     end

lib/utils/base_cli.rb

@@ -45,7 +45,10 @@ module Inspec
       target_options
       option :controls, type: :array,
         desc: 'A list of controls to run. Ignore all other tests.'
-      option :format, type: :string
+      option :format, type: :string,
+        desc: 'Which formatter to use: progress, documentation, json'
+      option :color, type: :boolean, default: true,
+        desc: 'Use colors in output.'
     end
 
     private