Gemfile: add several development gems

+  gem 'guard-annotate'
+
+  gem 'annotate', :git => 'git://github.com/ctran/annotate_models.git'
+  gem 'bullet'
+  gem 'lol_dba'
+  gem 'rails-erd'
+  gem 'quiet_assets'
+  gem 'rack-mini-profiler'
+
+  gem 'better_errors'
+	gem 'binding_of_caller'
+	gem 'awesome_print'
+
+	# gems that must be installed outside bundler
+	# gem 'zeus'
+	# gem 'metric_fu'
+	# gem 'byebug'
Guardfile: add annotate section
add bullet configuration to environment => development