ebin/cowboy.appを起動したい
http://stackoverflow.com/questions/16675767/how-to-run-erlang-rebar-build-application
erl -noshell -pa ebin -s cowboy
{"init terminating in do_boot",{undef,[{cowboy,start,[],[]},{init,start_it,1,[]},{init,start_em,1,[]}]}}
Crash dump was written to: erl_crash.dump
init terminating in do_boot ()クラッシュしたけど起動はしたみたい．
