web shots 에러 fix 함. (https://github.com/wkhtmltopdf/wkhtmltopdf/issues/1516)
RUN apt-get install libssl0.9.8 -y
한글 폰트 깨지는 것 해결위해 (http://minarae7.tistory.com/149)
RUN RUN apt-get install ttf-unfonts-core -y