* ngrx collection now extends @ngrx/schematics
* modify the nrwl `ngrx` schematic to use `@ngrx/schematics` to generate the initial source for actions, reducers, and effects
* modify the generated source to conform to Nx standards
* generate init and interface files
* remove template files for action, effect, and reducer scaffolding
* modify collection to extend `@ngrx/schematics` so the ngrx commands are also easily accessible
* inject dataloaded enums into action class
* configure nx workspace devDep on @ngrx/schematics version
* override ngrx effects.spec.ts with nx templated version
fixes#174.
