* Added unit test for Validator, minimum viable version.

* Added test-console to package list

* Completed minimum viable unit test for Validator

* Added Validator unit test for explicit 'undefined'

* replacing all ES6 imports with CJS require calls
resolves #2934
used the following regex to apply the changes in lib:
s/import\s+(\w+)\s+from\s+(.*);\s*$/var $1 = require($2).default;/
s/import\s+(\w+)\s+from\s+(.*)\s*$/var $1 = require($2).default;/

* cleaning up inconsistencies

- Also updated docs and examples for this
 - Fixed the positioning of the tooltip if groups was enabled
 - Removed missing parameters from Popup docstring

* Added HTML tooltip support for Timeline

* Fixed tooltip position on Firefox

* Added Timeline tooltip example

* Updated tooltip location to be next to the mouse

* Added HTML element to example

added example. Improved handling of options for hierarchical view.

See https://github.com/almende/vis/issues/1568#issuecomment-171961393

- Accepted pull request #1544, thanks @felixhayashi!
- Fixed documented bug in #1544.

not sure but for some reason, once the colorpicker is open, the buttons won't work correctly and the huecircle jumps back.