Add post-install JavaScript to determine OS and optionally install Redis

Partially fixes timschwab#10 (doesn't crash the installer anymore, still doesn't
  install Redis on anything other than Windows

Author: allout58

Diff for: package-lock.json

@@ -5,7 +5,7 @@
 	"main": "app.js",
 	"scripts": {
 		"start": "electron .",
-		"postinstall": "call \"dist/redis/install.bat\""
+		"postinstall": "node ./scripts/post-install.js"
 	},
 	"repository": {
 		"type": "git",

Diff for: package.json

@@ -0,0 +1,17 @@
+#! /usr/bin/env node
+const {exec} = require('child_process')
+
+switch (process.platform) {
+	case 'win32':
+		// TODO: Move the logic for installing on windows here from the bat file
+		exec('dist/redis/install.bat')
+		break
+	case 'darwin':
+		console.log(
+			'Automated install of Redis currently not implemented on Mac OS'
+		)
+		break
+	case 'linux':
+		console.log('Automated install of Redis currently not implemented on Linux')
+		break
+}