if Chrome that has webstore (for distinguishing Opera)
Merge pull request #44 from SaschaNaz/patch-2

if Chrome that has webstore (for distinguishing Opera)
Add credit for SaschaNaz
window.chrome && window.chrome.webstore
Merge pull request #45 from SaschaNaz/patch-3

window.chrome && window.chrome.webstore
Allow fallback to original page using pageAction icon
Remove both event handlers on return
Display console.error() with ErrorEvent
Merge pull request #47 from tomyun/eventhandlers

Worker측 이벤트 처리 개선
Merge pull request #48 from tomyun/chrome-fallback

크롬 확장 자동 등장시 원래 페이지로 돌아가기 지원
Version bump to 1.0.4