* Clean logs on startup; install server-side testing/linting
* Add eslint config, make all of app/ conform to its demands
* Add Node.js testing and linting to CI
* Lock project to Node.js 7.9.0, used by Electron 1.7.10
* New eslint error: trailing commas in function argumensts
Node 7.9.0 doesn't like trailing commas, but Electron does
* Move electron to devDependency, tell eslint it's built-in
This prevents the user from restarting the app by pressing space on
MacOS, which happens frequently during the course of normal typing of a
message.
In the future we'll move to a less-obtrusive system a little
more like Chrome, where you choose to do the restart when it is
convenient for you. For now, we minimize the chance of accidental
restart in the middle of typing a message.
