Updates travis.yml

Author: gasharova

.travis.yml

@@ -4,6 +4,11 @@ node_js:
 cache:
   directories:
   - node_modules # Cache the node_modules folder for quicker build times
+before_script:
+  - npm install -g typings typescript istanbul gulp-cli mocha
+  - npm install next
+  - typings install
+  - tsc
 script:
   - npm run build # Runs next build
   - npm run export # Runs next export and generates the out directory