Splitgraph

* Add ability to skip config injection at the end of config-manipulating functions (pass `-s`) and don't fail if the Docker socket isn't reachable

Full set of changes: [`v0.2.0...v0.2.1`](https://github.com/splitgraph/sgr/compare/v0.2.0...v0.2.1)

* Introducing the [Splitgraph Data Delivery Network](https://www.splitgraph.com/docs/splitgraph-cloud/data-delivery-network): a single SQL endpoint to query all datasets hosted on or proxied by Splitgraph Cloud with any PostgreSQL client.
* Extra `sgr cloud` commands:
* `sgr cloud sql` to query the Splitgraph DDN
* `sgr cloud search`, a CLI wrapper around https://www.splitgraph.com/search
* Add daily update check to `sgr`.

Full set of changes: [`v0.1.4...v0.2.0`](https://github.com/splitgraph/sgr/compare/v0.1.4...v0.2.0)

* Various dependency bumps (including PostGIS)
* Fix Splitfiles and `sgr import` not respectng the `SG_COMMIT_CHUNK_SIZE` envvar/config variable

Full set of changes: [`v0.1.3...v0.1.4`](https://github.com/splitgraph/sgr/compare/v0.1.3...v0.1.4)

* Fix Socrata querying for datasets with long column names (https://github.com/splitgraph/sgr/pull/268)

Full set of changes: [`v0.1.2...v0.1.3`](https://github.com/splitgraph/sgr/compare/v0.1.2...v0.1.3)

* Example for writing a custom FDW and integrating it with Splitgraph
* Add dbt adapter that uses Splitgraph data and a sample dbt project
* Socrata UX improvements
* Command line parameters that require JSON now also accept `filename.json` or `-` for stdin

Full set of changes: [`v0.1.1...v0.1.2`](https://github.com/splitgraph/sgr/compare/v0.1.1...v0.1.2)

* Fixed Socrata querying for datasets with columns that match keywords (e.g. `first`/`last`)

Full set of changes: [`v0.1.0...v0.1.1`](https://github.com/splitgraph/sgr/compare/v0.1.0...v0.1.1)