Migrations in the base template about dendritic

[davidbanham]

I agree they should be a component rather than part of base. I think what we probably want is everything pretty decomposed, but then an alias that installs All The Things. I think by default you should get a full suite of things, but if you only want to install bits and pieces you can do it manually one-by-one.

I looked for an existing RethinkDB migration engine and couldn't find a good one, so I wrote this. It's not rocket science.

Also, Redbeard is tied to RethinkDB. We don't need to worry about migration strategies on SQL or other document stores since that's not a target.

The whole point of Redbeard is the realtime stuff, in my view. The use of JSON schemas as models, the admin UI and the other ecosystem stuff is also really nice, but it's the realtime stuff that's the killer feature.