Docker에서 실행시 nginx+unicorn 조합으로 변경

unicorn gem 활성화, nginx+unicorn 조합으로 실행되도록 변경
Merge pull request #38 from seapy/master

Docker에서 실행시 nginx+unicorn 조합으로 변경
Merge remote-tracking branch 'upstream/master' into develop

Conflicts:
	Dockerfile