Revert "お絵かきチャット"

This reverts commit e309673dba70dfa1e86b3e45f49f62a60313d576.

Conflicts:
	app.js
	package.json
	views/index.ejs
Revert "socket.io依存記述"

This reverts commit ffda2e66c74206b6652b15280770082b20f01db8.

Conflicts:
	package.json
Merge branch 'chat'