fix(build): Fix minified standalone browser build

Previous version built with closure compiler wasn't exposing the global

Author: trodrigues

package.json

@@ -13,7 +13,7 @@
     "clean": "rimraf dist && rimraf browser-dist && rimraf coverage && rimraf out",
     "build": "npm run clean && npm run vendor && npm run build:dist && npm run build:standalone",
     "build:dist": "babel lib --out-dir dist",
-    "build:standalone": "webpack -p && ccjs browser-dist/contentful.js --compilation_level=ADVANCED_OPTIMIZATIONS > browser-dist/contentful.min.js 2>/dev/null",
+    "build:standalone": "webpack && webpack -p --output-filename contentful.min.js",
     "docs:build": "jsdoc -r -c jsdoc.json dist",
     "docs:dev": "npm run build && npm run docs:build",
     "docs:watch": "watchy -w lib,jsdoc-template npm run docs:dev",
@@ -62,7 +62,6 @@
     "babel-preset-es2015": "^6.3.13",
     "babel-register": "^6.4.3",
     "blue-tape": "^0.2.0",
-    "closurecompiler": "^1.5.2",
     "coveralls": "^2.11.6",
     "cz-conventional-changelog": "^1.1.5",
     "in-publish": "^2.0.0",