Some more progress

You guys made great progress at the hackathon!  I added a few things to what you started:

- re-enabled the query parameter processing to make it easier to extend in the future
- moved the API key to the calling example so it's not hardcoded in the widget
- ripped out a bunch of Freebase specific stuff that I'm sure will never be used (I left in stuff that potentially can be adapted to DPLA like language, search filter, etc)
- started updating the doc/example app to refer to DPLA instead of Freebase