Simplify scripts using lifecycle events

The WebWorker test in PR #1479 seems to fail for some mysterious
reason with a synchronous XHR requests. The reason was most
probably the importScript('../../pkg/sinon.js') call in the
webworker file was referencing a build file that wasn't built.

By now explicitly building this file as part of the test run
this error has now disappeared locally, and probably will
disappear on CircleCI as well.

fixes the build in #1479

package.json

@@ -15,15 +15,18 @@
   "license": "BSD-3-Clause",
   "scripts": {
     "test-node": "mocha --recursive -R dot test/",
-    "test-dev": "npm run test-node -- --watch -R min",
+    "test-dev": "run-s test-node -- --watch -R min",
     "test-headless": "mochify --recursive -R dot --grep WebWorker --invert --plugin [ proxyquire-universal ] test/",
     "test-coverage": "mochify --recursive -R dot --grep WebWorker --invert --plugin [ mochify-istanbul --exclude '**/+(test|node_modules)/**/*' --report text --report lcovonly --dir ./coverage ] test/",
-    "test-cloud": "npm run test-headless -- --wd",
+    "test-cloud": "run-s test-headless -- --wd",
     "test-webworker": "browserify --no-commondir --full-paths -p [ mocaccino -R spec --color ] test/webworker/webworker-support-assessment.js | phantomic --web-security false",
-    "test": "npm run test-node && npm run test-headless && npm run test-webworker",
+    "test": "run-s test-node test-headless test-webworker",
+    "build": "./build.js",
     "lint": "eslint .",
     "precommit": "lint-staged",
-    "prepublish": "rimraf pkg && ./build.js",
+    "pretest-webworker": "run-s build",
+    "prebuild": "rimraf pkg",
+    "prepublishOnly": "run -s build",
     "preversion": "./scripts/preversion.sh",
     "postversion": "./scripts/postversion.sh",
     "eslint-pre-commit": "./scripts/eslint-pre-commit"
@@ -53,6 +56,7 @@
     "mocha": "^3.1.2",
     "mochify": "^3.0.0",
     "mochify-istanbul": "^2.4.1",
+    "npm-run-all": "^4.0.2",
     "phantomic": "^1.4.0",
     "phantomjs-prebuilt": "^2.1.14",
     "proxyquire": "^1.8.0",