add some packages

node_modules/preserve/README.md

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+# preserve [![NPM version](https://badge.fury.io/js/preserve.svg)](http://badge.fury.io/js/preserve)
+
+> Temporarily substitute tokens in the given `string` with placeholders, then put them back after transforming the string.
+
+Useful for protecting tokens, like templates in HTML, from being mutated when the string is transformed in some way, like from a formatter/beautifier.
+
+**Example without `preserve`**
+
+Let's say you want to use [js-beautify] on a string of html with Lo-Dash/Underscore templates, such as: `<ul><li><%= name %></li></ul>`:
+
+js-beautify will render the template unusable (and apply incorrect formatting because of the unfamiliar syntax from the Lo-Dash template):
+
+```html
+<ul>
+  <li>
+    <%=n ame %>
+  </li>
+</ul>
+```
+
+**Example with `preserve`**
+
+Correct.
+
+```html
+<ul>
+  <li><%= name %></li>
+</ul>
+```
+
+For the record, this is just a random example, I've had very few issues with js-beautify in general. But with or without js-beautify, this kind of token mangling does happen sometimes when you use formatters, beautifiers or similar tools.
+
+## Install
+## Install with [npm](npmjs.org)
+
+```bash
+npm i preserve --save
+```
+
+## Run tests
+
+```bash
+npm test
+```
+
+## API
+### [.before](index.js#L23)
+
+Replace tokens in `str` with a temporary, heuristic placeholder.
+
+* `str` **{String}**    
+* `returns` **{String}**: String with placeholders.  
+
+```js
+tokens.before('{a\\,b}');
+//=> '{__ID1__}'
+```
+
+### [.after](index.js#L44)
+
+Replace placeholders in `str` with original tokens.
+
+* `str` **{String}**: String with placeholders    
+* `returns` **{String}** `str`: String with original tokens.  
+
+```js
+tokens.after('{__ID1__}');
+//=> '{a\\,b}'
+```
+
+
+## Contributing
+Pull requests and stars are always welcome. For bugs and feature requests, [please create an issue](https://github.com/jonschlinkert/preserve/issues)
+
+## Author
+
+**Jon Schlinkert**
+ 
++ [github/jonschlinkert](https://github.com/jonschlinkert)
++ [twitter/jonschlinkert](http://twitter.com/jonschlinkert) 
+
+## License
+Copyright (c) 2015-2015, Jon Schlinkert.
+Released under the MIT license
+
+***
+
+_This file was generated by [verb](https://github.com/assemble/verb) on January 10, 2015._
+
+[js-beautify]: https://github.com/beautify-web/js-beautify