Updated load interface (#253)

* kernel list support added

* simple spice as fixture

* removed abstractmethod tags

* added property tags

* addressed comments

* removed config, combined kernel and metakernel methods, added test for metakerenl queries

* added test to env var

* Add short name test for dawn

* added sorted driver list

* i don't remmeber

* updated tests to only need one reload for ale

* removed uneeded header

* removed cpp load notebook

* removed vis module

* updated write_metakernel code to use abspaths

* updated tests, removed json from repo and now is conda installed from conda-forge

* removed redundant json conversion in load func

* addressed commnets

* updated tests as per comments