chore(Travis): Update installed packages to scoped engines. Add explicit Node 8 run

Author: bmuenzenmeyer

.travis.yml

@@ -2,22 +2,22 @@ language: node_js
 
 node_js:
   - node
+  - 8
   - 6
 
 before_install:
   - phantomjs --version
 
 before_script:
-  - npm install patternengine-node-mustache
-  - npm install patternengine-node-underscore
-  - npm install patternengine-node-handlebars
+  - npm install @pattern-lab/patternengine-node-mustache
+  - npm install @pattern-lab/patternengine-node-underscore
+  - npm install @pattern-lab/patternengine-node-handlebars
   - npm install patternengine-node-twig
 
 branches:
   only:
     - master
     - dev
-    - dev-3.0
 
 notifications:
   webhooks: