Add target and serve to configurator.

	modified:   examples/rails.coffee
	modified:   lib/configurator.js
	modified:   lib/read_config_performer.js
Better error reporting.

 On branch master
	modified:   index.js
	modified:   lib/index.js
	modified:   lib/setup_proxy_server_performer.js
Automatically setup config file.

 On branch master
	modified:   index.js
	modified:   lib/index.js