npm: Upgrade to 1.3.3

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diff --git a/deps/npm/doc/cli/npm-submodule.md b/deps/npm/doc/cli/npm-submodule.md
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+npm-submodule(1) -- Add a package as a git submodule
+====================================================
+
+## SYNOPSIS
+
+    npm submodule <pkg>
+
+## DESCRIPTION
+
+If the specified package has a git repository url in its package.json
+description, then this command will add it as a git submodule at
+`node_modules/<pkg name>`.
+
+This is a convenience only.  From then on, it's up to you to manage
+updates by using the appropriate git commands.  npm will stubbornly
+refuse to update, modify, or remove anything with a `.git` subfolder
+in it.
+
+This command also does not install missing dependencies, if the package
+does not include them in its git repository.  If `npm ls` reports that
+things are missing, you can either install, link, or submodule them yourself,
+or you can do `npm explore <pkgname> -- npm install` to install the
+dependencies into the submodule folder.
+
+## SEE ALSO
+
+* package.json(5)
+* git help submodule