Added logfile and logdir configs

	modified:   lib/lambom/config.rb
Corrected message and return code and json_file option, in command line tool

	modified:   bin/lambom
	modified:   lib/lambom.rb
Converger with chef-solo working properly
	modified:   lib/lambom/converger.rb
	modified:   lib/lambom/shell_mixin.rb
	modified:   spec/converger_spec.rb