Building metadata is now optional. If you want to do it, do this:
datasette build *.db --metadata=metadata.json
Then when you run the server you can tell it to read from metadata:
datasette serve *.db --metadata=metadata.json
The Dockerfile generated by datasette publish now uses this mechanism.
Closes#60
I'm using click, and click recommends using a setup.py - so I've added one of
those. I also refactored code into a new datasite package. It's not quite
deploying to now properly at the moment though - I seem to have messed up the
path handling a bit.
Also snuck in a new template for the "Row" view.
Refs #40
