Add npm and minified builds

package.json

@@ -2,7 +2,7 @@
   "title": "html2canvas",
   "name": "html2canvas",
   "description": "Screenshots with JavaScript",
-  "main": "dist/html2canvas.js",
+  "main": "dist/npm/index.js",
   "version": "1.0.0-alpha.1",
   "author": {
     "name": "Niklas von Hertzen",
@@ -24,6 +24,8 @@
     "babel-core": "6.25.0",
     "babel-eslint": "7.2.3",
     "babel-loader": "7.1.1",
+    "babel-plugin-dev-expression": "0.2.1",
+    "babel-plugin-transform-es2015-modules-commonjs": "6.26.0",
     "babel-plugin-transform-object-rest-spread": "6.23.0",
     "babel-preset-es2015": "6.24.1",
     "babel-preset-flow": "6.23.0",
@@ -52,22 +54,26 @@
     "platform": "1.3.4",
     "prettier": "1.5.3",
     "promise-polyfill": "6.0.2",
+    "replace-in-file": "^3.0.0",
     "rimraf": "2.6.1",
     "serve-index": "1.9.0",
     "slash": "1.0.0",
+    "uglifyjs-webpack-plugin": "^1.1.2",
     "webpack": "3.4.1"
   },
   "scripts": {
     "build": "rimraf dist/ && node scripts/create-reftest-list && npm run build:npm && npm run build:browser",
-    "build:npm": "babel src/ -d dist/npm/",
+    "build:npm": "babel src/ -d dist/npm/ --plugins=dev-expression,transform-es2015-modules-commonjs && replace-in-file __VERSION__ '$npm_package_version' dist/npm/index.js",
     "build:browser": "webpack",
     "format": "prettier --single-quote --no-bracket-spacing --tab-width 4 --print-width 100 --write \"{src,tests,scripts}/**/*.js\"",
     "flow": "flow",
     "lint": "eslint src/**",
-    "test": "npm run flow && npm run lint && npm run karma",
+    "test": "npm run flow && npm run lint && npm run test:node && npm run karma",
+    "test:node": "mocha tests/node/*.js",
     "karma": "node karma",
     "watch": "webpack --progress --colors --watch",
-    "start": "node tests/server"
+    "start": "node tests/server",
+    "ss": "node $npm_package_version"
   },
   "homepage": "https://html2canvas.hertzen.com",
   "license": "MIT",