internal dependencies on MdcRippleModule

[rapropos]

Several components (textfield was what bit me) rely on having an EventRegistry provided. If one is importing individual component modules, a rather cryptic (for me, at least) error will ensue saying there is no provider for EventRegistry. I see that MdcRippleModule declares this provider, so one way to avoid the problem is to include it in the app module. Perhaps simply documenting this in a FAQ is the best approach, or maybe importing MdcRippleModule in MdcTextfieldModule et al would be preferable. My primary concern with doing things that way would be potential code duplication.

[trimox]

Thanks for reporting on your initial usage, and I've updated the getting-started guide.
Keeping this issue open to research options.

[trimox]

Got this figured out. PR incoming