fully support Windows

npm start

> irc@0.5.0 start E:\Source\irc
> npm run sass && NODE_ENV=production electron ./

> irc@0.5.0 sass E:\Source\irc
> node-sass src/sass/app.scss --output src/static/

Rendering Complete, saving .css file...
Wrote CSS to E:\Source\irc\src\static\app.css
'NODE_ENV' is not recognized as an internal or external command,
operable program or batch file.
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! irc@0.5.0 start: `npm run sass && NODE_ENV=production electron ./`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the irc@0.5.0 start script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:

Start by reproducing the failure with npm start on Windows and inspect the npm scripts shown in the error, especially the sass and Electron start commands. Check how src/sass/app.scss is compiled and how the production environment is set. Done means npm start completes successfully on Windows without the NODE_ENV command error.

Written by the indexing model from the issue text.