Initial clone of nodenv-default-packages with appropriate modifications

Why:

* Handling of root `npmrc` files with `nodenv` seems to be a hassle

Author: deiga

.gitignore

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+node_modules/

LICENSE

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+The MIT License (MIT)
+
+Copyright (c) 2017 Timo Sand
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

README.md

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+# nodenv-default-npmrc
+
+This nodenv plugin hooks into the `nodenv install` command to automatically
+install a `npmrc` file every time you install a new version of Node. It
+requires the `node-build` plugin to be installed.
+
+Forked from the excellent [`nodenv-default-packages`][nodenv-default-packages] plugin from
+[sstephenson][sstephenson].
+
+## Installation
+
+### Installing as a nodenv plugin
+
+Make sure you have the latest nodenv and node-build versions, then run:
+
+    git clone https://github.com/deiga/nodenv-default-npmrc.git $(nodenv root)/plugins/nodenv-default-npmrc
+
+### Installing with Homebrew (for OS X users)
+
+Mac OS X users can install nodenv-default-npmrc with the
+[Homebrew](http://brew.sh) package manager.
+
+*This is the recommended method of installation if you installed nodenv
+ with Homebrew.*
+
+```
+$ brew install nodenv/deiga/nodenv-default-npmrc
+```
+
+Or, if you would like to install the latest development release:
+
+```
+$ brew install --HEAD nodenv/deiga/nodenv-default-npmrc
+```
+
+## Usage
+
+nodenv-default-npmrc automatically installs the 
+`$(nodenv root)/default-npmrc` file to `${PREFIX}/etc/npmrc` every time you successfully install a new
+version of Node with `nodenv install`.
+
+
+## Credits
+
+Forked from [Sam Stephenson][sstephenson]'s [nodenv-default-packages][] by [Timo Sand][deiga].
+
+[sstephenson]: https://github.com/sstephenson
+[nodenv-default-packages]: https://github.com/rbenv/nodenv-default-packages
+[deiga]: https://github.com/deiga
+[nodenv]: https://github.com/nodenv/nodenv

etc/nodenv.d/install/default-npmrc.bash

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+#!/usr/bin/env bash
+if declare -Ff after_install >/dev/null; then
+  after_install install_default_npmrc
+else
+  echo "nodenv: nodenv-default-npmrc plugin requires node-build" >&2
+fi
+
+install_default_npmrc() {
+  # Only install default npmrc after successfully installing Node.
+  [ "$STATUS" = "0" ] || return 0
+
+  if [ -f "${NODENV_ROOT}/default-npmrc" ]; then
+    cp "${NODENV_ROOT}/default-npmrc"
+  fi
+}

install.sh

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+#!/usr/bin/env sh
+# Usage: PREFIX=/usr/local ./install.sh
+#
+# Installs nodenv-default-npmrc under $PREFIX.
+
+set -e
+set -u
+
+cd "$(dirname "$0")"
+
+if [ -z "${PREFIX}" ]; then
+  PREFIX="/usr/local"
+fi
+
+ETC_PATH="${PREFIX}/etc/nodenv.d"
+
+mkdir -p "$ETC_PATH"
+
+cp -RPp etc/nodenv.d/* "$ETC_PATH"

package.json

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+{
+  "name": "nodenv-default-npmrc",
+  "version": "1.0.0",
+  "private": true,
+  "description": "Install default npmrc every time you install a new version of Node",
+  "homepage": "https://github.com/deiga/nodenv-default-npmrc#readme",
+  "license": "MIT",
+  "author": "Timo Sand <[email protected]>",
+  "contributors": [
+  ],
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/deiga/nodenv-default-npmrc.git"
+  },
+  "bugs": {
+    "url": "https://github.com/deiga/nodenv-default-npmrc/issues"
+  },
+  "directories": {
+    "bin": "bin",
+    "lib": "libexec",
+    "test": "test"
+  },
+  "scripts": {
+    "publish:brew": "brew-publish $npm_package_name v$npm_package_version",
+    "postversion": "git push --follow-tags && npm run publish:brew"
+  },
+  "devDependencies": {
+    "brew-publish": "^2.0.0"
+  }
+}