Add vulcanize to tools.

tools/vulcanize/node_modules/vulcanize/node_modules/cheerio/CONTRIBUTING.md

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+# Contributing to Cheerio
+
+Thanks for your interest in contributing to the project! Here's a rundown of
+how we'd like to work with you:
+
+1. File an issue on GitHub describing the contribution you'd like to make. This
+   will help us to get you started on the right foot.
+2. Create a single commit that addresses the issue:
+    1. Follow the project's code style (see below)
+    2. Add enough unit tests to "prove" that your patch is correct
+    3. Update the project documentation as needed (see below)
+    4. Describe your approach with as much detail as necessary in the git
+       commit message
+3. Open a pull request, and reference the initial issue in the pull request
+   message.
+
+# Documentation
+
+Any API change should be reflected in the project's README.md file. Reuse
+[jQuery's documentation](http://api.jquery.com) wherever possible, but take
+care to note aspects that make Cheerio distinct.
+
+# Code Style
+
+This section is by no means complete. For undocumented stylistic choices,
+please try to maintain consistency with the code base.
+
+- Single quotes: `'`
+- Whitespace
+  - Two-space "soft" tabs
+  - Once space following control flow statements (`if (condition) {` rather
+    than `if(condition) {`)
+  - Remove trailing spaces
+  - [End each file with a newline
+    character.](https://github.com/editorconfig/editorconfig/wiki/Newline-at-End-of-File-Support)
+- Terminate every statement with a semicolon
+- Private functionality (for re-using functionality that isn't part of the
+  jQuery API)
+  - *Static methods*: If the functionality does not require a reference to a
+    Cheerio instance, simply define a named function within the module it is
+    needed.
+  - *Instance methods*: If the functionality requires a reference to a Cheerio
+    instance, informally define the method as "private" using the following
+    conventions:
+    - Define the method as a function on the Cheerio prototype
+    - Prefix the method name with an underscore (`_`) character
+    - Include `@api private` in the code comment the documents the method