Wrap CLI in Node runner for platform independence

Linux needs `#!/usr/bin/env -S` but this breaks Windows shims
<npm/cmd-shim#54>

Wrap in another layer of Node as a workaround.

cli.js

@@ -0,0 +1,9 @@
+#!/usr/bin/env node
+// Cross-platform launcher for Node with source-map support
+require('child_process').spawnSync('node', [
+  '--enable-source-maps',
+  require('path').join(__dirname, 'lib/svgtiler.js'),
+  ...process.argv.slice(2)
+], {
+  stdio: 'inherit'
+});

package.json

@@ -21,11 +21,11 @@
   },
   "main": "lib/svgtiler.js",
   "bin": {
-    "svgtiler": "lib/svgtiler.js"
+    "svgtiler": "cli.js"
   },
   "preferGlobal": true,
   "scripts": {
-    "prepare": "coffee --no-header --bare -o lib -c src/svgtiler.coffee",
+    "prepare": "coffee -o lib -c src/svgtiler.coffee",
     "test": "make test"
   },
   "dependencies": {

src/svgtiler.coffee

@@ -1,7 +1,3 @@
-`#!/usr/bin/env -S node --enable-source-maps
-(function() {
-`
-
 unless window?
   path = require 'path'
   fs = require 'fs'
@@ -1616,5 +1612,3 @@ if module? and require?.main == module and not window?
   require('module').Module._initPaths()
 
   main()
-
-`}).call(this)`