README 수정

- capybara-webkit gem 설치하는 방법 추가
Production 환경 이메일 설정

- mandrill 서버 이용해서 Production에서 이메일 전송
Merge pull request #21 from seapy/master

Production 이메일 설정 및 이메일 수정
오타 수정

- docker_alias 설정파일 오류 수정
Merge pull request #22 from seapy/master

오타 수정
.env 파일을 gitignore에 추가
DockerAlias 오류 수정

- Production 환경에서 클래스를 찾을수 없어서 발생하는 오류 수정
Docker 배포에 대한 README 수정
Merge pull request #23 from seapy/master

DockerAlias 오류 수정 및 README 수정
dockerfile에 imagemagick 추가함.
Merge remote-tracking branch 'upstream/master' into develop