* Proof of concept with copied options + handling from network

* Added unit test for Graph3d, for checking default syntax; completed def's of all options, autoByDefault not handled yet.

* Fixes for options in playground example

* Added onclick options to graph3d documentation

* Fixes in graph3d examples

* Final fixes for option definitions in Graph3d

* Fixed handling of 'undefined' in options, enhanced graph3d unit test

* Disabled console output in graph3d unit test

* Upgrade webpack module

* Add unit tests for Graph3D issue

This adds a unit test for PR #3255 which fixes #3251.
The unit test will fail without the PR merged.

**NOTE:** This also adds module `canvas`, required for the unit test. This module
proved to be quite fickly to install properly. During reviewing, please pay special
attention to the proper installation of this modul. I.e. do following to test:

```
> npm install                      # If no errors, continue
> npm test /tests/Graph3D.test.js  # Run unit test isolated
```

* Fix for travis-cl

* Add giflib to travis test definition

* Add libgif to travis test definition - take 2

* Proper setup and teardown for jsdom-global

* Minor fixes and cleanup