install gulp to process code

node_modules/plugin-error/README.md

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+# plugin-error [![NPM version](https://badge.fury.io/js/plugin-error.svg)](http://badge.fury.io/js/plugin-error)  [![Build Status](https://travis-ci.org/jonschlinkert/plugin-error.svg)](https://travis-ci.org/jonschlinkert/plugin-error)
+
+> Error handling for vinyl plugins. Just an abstraction of what's in gulp-util with minor changes.
+
+Install with [npm](https://www.npmjs.com/)
+
+```sh
+$ npm i plugin-error --save
+```
+
+## Usage
+
+```js
+var PluginError = require('plugin-error');
+```
+
+### new PluginError(pluginName, message[, options]);
+
+**Params**
+
+* `pluginName` should be the module name of your plugin
+* `message` **{String|Object}**: may be a string or an existing error object
+* `options` **{Object}**
+
+**Behavior:**
+
+* By default the stack will not be shown. Set `options.showStack` to true if you think the stack is important for your error.
+* If you pass an error object as the message the stack will be pulled from that, otherwise one will be created.
+* If you pass in a custom stack string you need to include the message along with that.
+* Error properties will be included in `err.toString()`, but may be omitted by including `{showProperties: false}` in the options.
+
+**Examples**
+
+All of the following are acceptable forms of instantiation:
+
+```javascript
+var err = new PluginError('test', {
+  message: 'something broke'
+});
+
+var err = new PluginError({
+  plugin: 'test',
+  message: 'something broke'
+});
+
+var err = new PluginError('test', 'something broke');
+
+var err = new PluginError('test', 'something broke', {showStack: true});
+
+var existingError = new Error('OMG');
+var err = new PluginError('test', existingError, {showStack: true});
+```
+
+## Related projects
+
+* [assemble](http://assemble.io): Static site generator for Grunt.js, Yeoman and Node.js. Used by Zurb Foundation, Zurb Ink, H5BP/Effeckt,… [more](http://assemble.io)
+* [gulp-util](https://github.com/wearefractal/gulp-util#readme): Utility functions for gulp plugins
+* [gulp](http://gulpjs.com): The streaming build system
+* [generate](https://github.com/generate/generate): Project generator, for node.js.
+* [verb](https://github.com/assemble/verb): Documentation generator for GitHub projects. Extremely powerful, easy to use, can generate anything from API… [more](https://github.com/assemble/verb)
+
+## Running tests
+
+Install dev dependencies:
+
+```sh
+$ npm i -d && npm test
+```
+
+## Contributing
+
+Pull requests and stars are always welcome. For bugs and feature requests, [please create an issue](https://github.com/jonschlinkert/plugin-error/issues/new)
+
+## Author
+
+**Jon Schlinkert**
+
++ [github/jonschlinkert](https://github.com/jonschlinkert)
++ [twitter/jonschlinkert](http://twitter.com/jonschlinkert)
+
+## License
+
+Copyright © 2015 Jon Schlinkert
+Released under the MIT license.
+
+***
+
+_This file was generated by [verb-cli](https://github.com/assemble/verb-cli) on May 31, 2015._