Move NodeJS-related scripts from Makefile to package.json

The Makefile then is simply a dumb wrapper that calls commands defined in the
`package.json` or `tox.ini`, depending if it's JavaScript or Python. This
allows us to rely on their respective package manager to run the correct
version of each executable (avoiding having to mess with $PATH).

I also changed the testing NODE_ENV to "test", as it's the most common name.

Makefile

@@ -2,8 +2,6 @@
 
 .DEFAULT_GOAL := help
 
-export PATH := $(PATH):./node_modules/.bin
-
 PACKAGE := $(shell grep '^PACKAGE =' setup.py | cut -d "'" -f2)
 REPOSITORY := 'frictionlessdata/goodtables.io'
 SHELL := /bin/bash
@@ -28,23 +26,23 @@ lint-backend: ## Run lint checker on the backend app
 	tox -e lint
 
 lint-frontend: ## Run lint checker on frontend app
-	eslint --ext js,vue frontend
+	npm run lint
 
 lint: lint-backend lint-frontend ## Run all lint checkers
 
 test-unit-backend: ## Run the unit tests for the backend app
 	tox
 
 test-unit-frontend: ## Run the unit tests for the frontend app
-	NODE_ENV=testing karma start
+	npm test
 
 test-unit-frontend-watch: ## Run the unit tests for the frontend app
-	NODE_ENV=testing karma start --auto-watch --no-single-run
+	npm run test:watch
 
 test-unit: test-unit-backend test-unit-frontend ## Run all tests
 
 test-e2e: ## Run end to end tests
-	NODE_ENV=testing node rune2e.js
+	npm run test:e2e
 
 test: lint test-unit test-e2e ## Run all tests
 
@@ -72,13 +70,13 @@ migrate: ## Run database migrations for the app
 	alembic upgrade head
 
 frontend: ## Compile the frontend assets
-	NODE_ENV=production webpack --progress --hide-modules
+	npm run build
 
 frontend-dev: ## Compile the frontend assets for development
-	webpack --output-pathinfo --progress --hide-modules
+	npm run build:dev
 
 frontend-watch: ## Compile the frontend assets for development using watch mode
-	webpack --output-pathinfo --progress --hide-modules --watch
+	npm run build:watch
 
 app: ## Serve the app with Gunicorn
 	gunicorn goodtablesio.app:app --config gunicorn_settings.py

package.json

@@ -3,6 +3,15 @@
   "version": "0.0.0",
   "description": "Continuous data validation, as a service.",
   "license": "AGPL-3.0",
+  "scripts": {
+    "test": "NODE_ENV=test karma start",
+    "test:e2e": "NODE_ENV=test node rune2e.js",
+    "test:watch": "NODE_ENV=test karma start --auto-watch --no-single-run",
+    "lint": "eslint --ext js,vue frontend",
+    "build": "NODE_ENV=production webpack --progress --hide-modules",
+    "build:dev": "webpack --output-pathinfo --progress --hode-modules",
+    "build:watch": "webpack --output-pathinfo --progress --hide-modules --watch"
+  },
   "dependencies": {
     "axios": "^0.15.3",
     "goodtables": "^0.7.2",