add a definition that was not enough
fix reference
Merge pull request #3370 from horiuchi/log4js

add a definition that was not enough: log4js
rename peerjs/Peer.d.ts
Merge pull request #3372 from nakakura/peer-rename

rename peerjs/Peer.d.ts
Merge branch 'master' of https://github.com/borisyankov/DefinitelyTyped