* 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
