Merge pull request #4 from stamen/librarify

Librarify

.gitignore

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+node_modules
+dist
+*.swp
+package-lock.json

package.json

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+{
+  "name": "geo-albers-usa-territories",
+  "version": "0.0.1",
+  "description": "A map projection including all US overseas territories.",
+  "main": "dist/geo-albers-usa-territories.js",
+  "scripts": {
+    "prepublish": "rollup --config"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/stamen/us-albers-territories.git"
+  },
+  "keywords": [
+    "Map",
+    "Geo",
+    "GIS",
+    "D3"
+  ],
+  "author": "Alan McConchie",
+  "contributors": [
+    "Curran Kelleher"
+  ],
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/stamen/geo-albers-usa-territories/issues"
+  },
+  "homepage": "https://github.com/stamen/geo-albers-usa-territories#readme",
+  "devDependencies": {
+    "rollup": "^2.18.1"
+  }
+}

rollup.config.js

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+export default {
+  input: 'src/index.js',
+  external: ['d3-geo'],
+  output: {
+    file: 'dist/us-albers-territories.js',
+    format: 'umd',
+    name: 'geoAlbersUsaTerritories',
+    globals: {
+      'd3-geo': 'd3'
+    }
+  }
+};