Don't build and test on npm install

Speed up travis builds, speed up local installs, unbreak 0.12 tests

Author: leebyron

package.json

@@ -28,7 +28,7 @@
     "mocha": "src/**/__tests__/**/*.js"
   },
   "scripts": {
-    "prepublish": "npm test && npm run build",
+    "prepublish": "./resources/prepublish.sh",
     "test": "npm run lint && npm run check && npm run testonly",
     "testonly": "babel-node ./node_modules/.bin/_mocha $npm_package_options_mocha",
     "lint": "eslint src",

resources/prepublish.sh

@@ -0,0 +1,8 @@
+# Because of a long-running npm issue (https://github.com/npm/npm/issues/3059)
+# prepublish runs after `npm install` and `npm pack`.
+# In order to only run prepublish before `npm publish`, we have to check argv.
+if node -e "process.exit(($npm_config_argv).original[0].indexOf('pu') === 0)"; then
+  exit 0;
+fi
+
+npm test && npm run build