Use doc formatter again (instead of Fuubar)

Gemfile

@@ -8,10 +8,6 @@ group :guard do
   gem 'guard-ronn'
 end
 
-group :test do
-  gem 'fuubar'
-end
-
 require 'rbconfig'
 
 if RbConfig::CONFIG['target_os'] =~ /darwin/i

Guardfile

@@ -1,4 +1,4 @@
-guard :rspec, :version => 2, :keep_failed => false, :cli => '--format Fuubar' do
+guard :rspec, :version => 2, :keep_failed => false, :cli => '-f doc' do
   watch(%r{^spec/.+_spec\.rb$})
   watch(%r{^lib/(.+)\.rb$})     { |m| "spec/#{m[1]}_spec.rb" }
   watch('spec/spec_helper.rb')  { "spec" }