Update readme and build script

README.md

@@ -38,6 +38,21 @@ var simulation = d3.forceSimulation(nodes);
 </script>
 ```
 
+## File structure
+- [index.js](index.js) Export list of the module
+- [src/](src) Source code of the module
+- [package.json](package.json) Node.js moudle descriptor with build scripts
+- [img](img) Images for this readme file
+- [examples](examples) An example page running all the algorithms implemented
+
+## Building
+```bash
+npm run build
+npm run minify
+npm run zip
+```
+See package.json for more details.
+
 ## API Reference
 
 #### Spring Model

package.json

@@ -12,14 +12,12 @@
   "main": "build/d3-spring-model.js",
   "jsnext:main": "index",
   "scripts": {
-    "pretest": "rm -rf build && mkdir build && rollup -g d3-force:d3,d3-dispatch:d3,d3-quadtree:d3,d3-collection:d3 -f umd -n d3 -o build/d3-spring-model.js -- index.js",
+    "build": "rimraf build && mkdir build && rollup -g d3-force:d3,d3-dispatch:d3,d3-quadtree:d3,d3-collection:d3 -f umd -n d3 -o build/d3-spring-model.js -- index.js",
-    "test": "tape 'test/**/*-test.js'",
+    "minify": "node_modules/uglify-es/bin/uglifyjs build/d3-spring-model.js -c -m -o build/d3-spring-model.min.js",
-    "prepublish": "npm run test && node_modules/uglify-es/bin/uglifyjs build/d3-spring-model.js -c -m -o build/d3-spring-model.min.js",
+    "zip": "zip -j build/d3-spring-model.zip -- LICENSE README.md build/d3-spring-model.js build/d3-spring-model.min.js"
-    "postpublish": "zip -j build/d3-spring-model.zip -- LICENSE README.md build/d3-spring-model.js build/d3-spring-model.min.js"
   },
   "devDependencies": {
     "rollup": "0.36",
-    "tape": "4",
     "uglify-js": "git+https://github.com/mishoo/UglifyJS2.git#harmony"
   },
   "dependencies": {