fielddb-angular build added to the travis continous integration testing

In order to run continuous deployment on the psycholing app https://github.com/ProjetDeRechercheSurLecriture/DyslexDisorthGame/issues/161, we should include the new fielddb-angular core module as part of the travis build.

Before:
* build fielddb commonjs

After:
* build fielddb commonjs
* build fielddb angular core modules


In the future we can add the other modules which have build and tests that we want travis to run