tools: Fix reinstall script for working across all platforms.

Make reinstall script compatible with Windows. 

Fixes #440.

app/package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "zulip",
-  "version": "1.8.1",
+  "version": "1.8.2",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {

package.json

@@ -22,7 +22,7 @@
   },
   "scripts": {
     "start": "electron app --disable-http-cache --no-electron-connect",
-    "reinstall": "./tools/reinstall-node-modules",
+    "reinstall": "node ./tools/reinstall-node-modules.js",
     "postinstall": "electron-builder install-app-deps",
     "test": "xo",
     "test-e2e": "gulp test-e2e",

tools/reinstall-node-modules.js

@@ -0,0 +1,18 @@
+#!/usr/bin/env node
+const {exec} = require('child_process');
+const path = require('path');
+
+const isWindows = process.platform === 'win32';
+const command = path.join(__dirname, `reinstall-node-modules${isWindows ? '.cmd' : ''}`);
+
+const proc = exec(command, error => {
+	if (error) {
+		console.error(error);
+	}
+});
+
+proc.stdout.on('data', data => console.log(data.toString()));
+proc.stderr.on('data', data => console.error(data.toString()));
+proc.on('exit', code => {
+	process.exit(code);
+});