Merge pull request #1 from claabs/develop

TypeORM 0.3

Update deps, bump version

Add ability to generate a sentence with a start seed fragment

Add indices to relations to drastically speed up delete cascades.

Faster corpus pruning

Switch delete to SQL delete function to improve mass delete performance

Add creation and removal by tags.

Rewrite database schema with a breaking change.
Drastically slim down import/export code.

Bump version 4.0.2

Add migration to connection

Clarify delete impacts