Notes feature, progress

Addes notes table, model, controller and routes.
Fixed up ajax'd notes/_form.
You can now show and save notes.
Remaining issue: Form does not dismiss on successful save. Note sure why the hookup on "ajax:success" doesn't fire. Don't know enough about UJS in Rails and Pjax.
Fix a few bugs, e.g. includes(:brewery) -> includes(:breweries)
Fixed seed file, with UTF-8 encoding and missing abs values; dropped 'discontinued' attribute (no longer in schema, apparently)