Build: Improve AppVeyor & Travis config

.travis.yml

@@ -1,6 +1,7 @@
 sudo: false
 language: node_js
 node_js:
+  - "8"
   - "6"
   - "4"
   - "0.12"

appveyor.yml

@@ -8,17 +8,17 @@ environment:
     - nodejs_version: "0.12"
     - nodejs_version: "4"
     - nodejs_version: "6"
+    - nodejs_version: "8"
 
 install:
-  - npm -g install npm@2
-  - set PATH=%APPDATA%\npm;%PATH%
+  - npm install -g npm@^3
   - ps: Install-Product node $env:nodejs_version
   - npm install
 
 test_script:
   - node --version
   - npm --version
-  - npm test
+  - cmd: npm test
 
 build: off
 

package.json

@@ -26,7 +26,7 @@
     "lint": "eslint . && jscs index.js bin/ lib/ test/",
     "prepublish": "marked-man --name gulp docs/CLI.md > gulp.1",
     "pretest": "npm run lint",
-    "test": "mocha --async-only --timeout 3000 test/lib test",
+    "test": "mocha --async-only --timeout 5000 test/lib test",
     "cover": "nyc --reporter=lcov --reporter=text-summary npm test",
     "coveralls": "nyc --reporter=text-lcov npm test | coveralls",
     "changelog": "github-changes -o gulpjs -r gulp-cli -b master -f ./CHANGELOG.md --order-semver --use-commit-body"