simplify bin scripts and get them working

Original commit: elastic/kibana-plugin-helpers@1455f09194

packages/kbn-plugin-helpers/lib/command.js

@@ -0,0 +1,19 @@
+#!/usr/bin/env node
+
+module.exports = function (name, mod) {
+  var pkg = require('../package.json');
+  var program = require('commander');
+  var docs = require('../docs');
+  var idPlugin = require('./id_plugin');
+  var task = require('../tasks/' + name);
+
+  program
+  .version(pkg.version)
+  .on('--help', docs(name));
+
+  mod(program);
+
+  program.parse(process.argv);
+
+  task(idPlugin());
+};

packages/kbn-plugin-helpers/lib/id_plugin.js

@@ -0,0 +1,15 @@
+var resolve = require('path').resolve;
+
+module.exports = function () {
+  var root = process.cwd();
+  var pkg = require(resolve(root, 'package.json'));
+
+  return {
+    root: root,
+    kibanaRoot: resolve(root, '../kibana'),
+    id: pkg.name,
+    pkg: pkg,
+    version: pkg.version,
+    config: (pkg.config && pkg.config.kibanaPluginHelpers) || {}
+  };
+};