Ignore built files and clean properly

Author: jasonkarns

.gitignore

@@ -1,2 +1,5 @@
 /node_modules
+/package*/
+/tmp
+
 /nodenv-jetbrains-npm-*.tgz

package.json

@@ -23,7 +23,8 @@
     "bin"
   ],
   "scripts": {
-    "clean": "git clean -fX",
+    "clean": "rm -rfv package*/ nodenv-jetbrains-npm-*.tgz",
+    "start": "bin/npm-cli.js",
     "postversion": "npm publish",
     "prepublishOnly": "npm run publish:github",
     "publish:github": "git push --follow-tags"