jeado.ko 스피커 정보 업데이트
Merge branch 'master' of github.com:GDG-Korea/zeppelin

Conflicts:
	_data/speakers.yml
merge 나머지 파일..추가
AngularJS 2.0 준비하세요 세션 내용 업데이트
안쓰는 google-map.html 삭제
스케쥴 목록 빈칸은 합쳐져서 보여주도록 변경.
세션, 스피커 모달 Language, Complexity 한글로 변경

Language는 개발언어로 사용새 변경
Merge branch 'master' of github.com:GDG-Korea/zeppelin
세션내용 스피피커 내용 업데이트.
Merge branch 'master' of github.com:GDG-Korea/zeppelin