Enforce node / npm versions, add package-lock.json (#57)

* Enforce node / npm versions, add package-lock.json

* Have travis respect nvmrc. Add nvmrc.

.nvmrc

@@ -0,0 +1 @@
+8

.travis.yml

@@ -2,9 +2,6 @@ dist: trusty
 sudo: required
 language: node_js
 
-node_js:
-  - 7
-
 before_install:
   - export CHROME_BIN=chromium-browser
   - export DISPLAY=:99.0

Dockerfile

@@ -1,4 +1,4 @@
-FROM node:7.7.2
+FROM node:8.1.4
 
 WORKDIR /usr/app
 

package.json

@@ -3,6 +3,10 @@
   "version": "0.0.1",
   "main": "common/index.jsx",
   "description": "MyEtherWallet v4",
+  "engines": {
+    "node": ">= 8.0.0",
+    "npm": ">= 5.0.0"
+  },
   "dependencies": {
     "big.js": "^3.1.3",
     "ethereum-blockies": "https://github.com/MyEtherWallet/blockies.git",
@@ -44,6 +48,7 @@
     "babel-preset-react-optimize": "^1.0.1",
     "babel-preset-stage-0": "^6.22.0",
     "babel-runtime": "^6.23.0",
+    "check-node-version": "^2.1.0",
     "copy-webpack-plugin": "^4.0.1",
     "css-loader": "^0.28.0",
     "enzyme": "^2.8.0",
@@ -84,9 +89,13 @@
   "scripts": {
     "db": "nodemon ./db",
     "build": "webpack --config webpack_config/webpack.prod.js",
+    "prebuild": "check-node-version --package",
     "build:demo": "BUILD_GH_PAGES=true webpack --config webpack_config/webpack.prod.js",
+    "prebuild:demo": "check-node-version --package",
     "test": "jest --config=jest_config/jest.config.json --coverage",
+    "pretest": "check-node-version --package",
     "dev": "node webpack_config/server.js",
+    "predev": "check-node-version --package",
     "flow": "flow",
     "start": "npm run dev",
     "precommit": "lint-staged"