Quick example of a collision test integration test (#265)

* Quick example of a collision test integration test

* Add a test for ghost and hidden sprites

* enable scratch/es6 which then had my lint error for `(param) => {}` arrows

* cleanup npm test command

* an a was an an but should have been an a

* 2space tabs for the html doc

* Add some comments in the integration index html

* Add a few more comments about intentionally leaking variables into the global scope

* add some more comments for the integration helper and add a timeout

* 4 space tabs are actually correct

* adding even more comments and improving readability a little

* fix lint no-shadow rule

* fix indentation on comment

package.json

@@ -18,8 +18,8 @@
     "prepublish": "npm run build",
     "prepublish-watch": "npm run watch",
     "start": "webpack-dev-server",
-    "tap": "./node_modules/.bin/tap ./test/unit/*.js",
-    "test": "npm run lint && npm run docs && npm run tap",
+    "tap": "tap test/unit test/integration",
+    "test": "npm run lint && npm run docs && npm run build && npm run tap",
     "version": "json -f package.json -I -e \"this.repository.sha = '$(git log -n1 --pretty=format:%H)'\"",
     "watch": "webpack --progress --colors --watch --watch-poll"
   },
@@ -30,6 +30,7 @@
     "babel-polyfill": "^6.22.0",
     "babel-preset-es2015": "^6.22.0",
     "base64-loader": "^1.0.0",
+    "chromeless": "^1.5.1",
     "copy-webpack-plugin": "^4.0.1",
     "docdash": "^0.4.0",
     "eslint": "^4.6.1",
@@ -42,7 +43,9 @@
     "json": "^9.0.4",
     "linebreak": "0.3.0",
     "raw-loader": "^0.5.1",
+    "scratch-storage": "^0.4.0",
     "scratch-svg-renderer": "0.1.0-prerelease.20180423193917",
+    "scratch-vm": "0.1.0-prerelease.1524520946",
     "tap": "^11.0.0",
     "travis-after-all": "^1.4.4",
     "twgl.js": "4.4.0",