Publish metadata

[okdistribute]

This along with https://github.com/datproject/datproject.org/pull/594 will fix #803. That means when you dat publish, the registry will automatically pick up your metadata and have it ready for display so that even if the dat is down, we have a first picture of what the dat is. That also makes sure that the url is legit before allowing the publish to happen.

It also bumps dat-registry to 3.0.3 for a tiny bug fix.

[joehand]

Sweet! Does publish on the registry wait to return 200 until the dat metadata is downloaded? Couldn't quite see in the code.

[okdistribute]

It gives it 5 seconds, and then if it doesn't get any entries it returns an error with message 'timed out'. https://github.com/datproject/dat-registry-api/blob/c9a01211fd50b456ab269a066ffdc7d017a9fd4f/api/dats.js#L44

[okdistribute]

@joehand just committed a little bit on an error message, what do you think?

[joehand]

Looks good and ready to merge but I want to see what @Karissa says about uploading the full dat.json bug:

ERROR: insert into "dats" ("author", "description", "id", "name", "title", "url", "user_id") values ('Joe Hand', 'space for jhand to write and play', 'aa0d2f3d-00e2-4260-b054-7abbc86adcf8', 'jhand-space', 'jhand space', 'dat://ad7e5e6562e920af0ae78d20e1a6a2b599c658df46a9b73ef7951180fcd0e56d', '9d0afbf0-e0e4-41b0-b398-ba86bf419383') - SQLITE_ERROR: table dats has no column named author