jasmine: tests helpers

* Adds event_checker and initialization checker to quickly check
  properly connected events and initialization of variables in js
  objects.

Signed-off-by: Kamil Neczaj <kamil.neczaj@cern.ch>
comment for jasmine registry
search: facets

Signed-off-by: Kamil Neczaj <kamil.neczaj@cern.ch>
search: tests for facets

Signed-off-by: Kamil Neczaj <kamil.neczaj@cern.ch>