Make and document npm run build now a mandatory step of the install/build setup

This has several reasons, benefits and consequences:

- When running on root (which is not recommended anyway), `npm run build` was already necessary.
- This allows to not use the `prepublish` hook, whose behavior is going to change in npm v5 and again in npm v6.
- This allows to create both production and development builds when running from source.
- It makes `npm run build` compatible with Windows again for development environments (lost in previous commit).
- It uses the `prepublishOnly` hook added in npm v4. Since this hook is not available prior to that, deployment to npm from Travis has to be done on the Node.js v7 environment.

.travis.yml

@@ -11,6 +11,9 @@ cache:
   directories:
     - ~/.npm
 
+before_script:
+  - npm run build
+
 notifications:
   email:
     on_success: never
@@ -23,6 +26,6 @@ deploy:
   api_key:
     secure: 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
   on:
-    node: '4'
+    node: 7
     tags: true
     repo: thelounge/lounge

README.md

@@ -50,14 +50,12 @@ The following commands install the development version of The Lounge:
 git clone https://github.com/thelounge/lounge.git
 cd lounge
 npm install
+NODE_ENV=production npm run build
 npm start
 ```
 
-A word of caution:
-
-- While it is the most recent codebase, this is not production-ready!
-- It is not recommended to run this as root. However, if you decide to do so,
-  you will have to run `npm run build`.
+⚠️ While it is the most recent codebase, this is not production-ready! Run at
+your own risk. It is also not recommended to run this as root.
 
 ## Development setup
 

appveyor.yml

@@ -13,6 +13,7 @@ environment:
 install:
   - ps: Install-Product node $env:nodejs_version
   - appveyor-retry npm install
+  - npm run build
   - npm install mocha-appveyor-reporter
   - echo --reporter mocha-appveyor-reporter >> test/mocha.opts
 

package.json

@@ -24,7 +24,7 @@
     "lint": "npm-run-all -c lint:*",
     "lint:js": "eslint .",
     "lint:css": "stylelint \"**/*.css\"",
-    "prepublish": "NODE_ENV=production npm run build"
+    "prepublishOnly": "NODE_ENV=production npm run build"
   },
   "keywords": [
     "lounge",