repoll 플러그인 API 정의 후 index.html에 반영
Merge pull request #14 from chitacan/master

repoll plugin 업데이트
repoll플러그인 구현 구상
Merge branch 'master' of github.com:octoberskyjs-lab/reveal.js

Conflicts:
	index.html
	plugin/repoll/repoll.js
Merge 오류내용 수정
Merge pull request #15 from haibane84/master

Repoll API 정의 및 Repoll Plugin 기본 골격 추가.
fix typo.
fix indentation.
add dummy chart data for test.
fix data when server emit client_vote event.
modify client_vote event.