Added typescript.

Adding typescript, because build is complaining that there is no tsc (even when it is executed 2 times before).

Author: Nedyalko Nikolov

.travis.yml

@@ -49,6 +49,7 @@ script:
 
 before_deploy:
 - cd ../nativescript-angular
+- npm install typescript -g
 - npm install
 - node ../build/travis-scripts/add-publishConfig.js next