GeezerVison

…ems to hang when executed in a function, need to investigate.

Conflicts:
	src/Cedar.EventStore.Tests/EventStoreAcceptanceTests.DeleteStream.cs

Changed When_delete_stream_with_a_non_matching_expected_version_then_should_throw to include a couple of events in the stream, otherwise it tests deleting a non-existing stream.

…ion string name (can't leak Npgsql types due to assembly versioning)

Change connection handling to create connection on-demand (issues with TPL + concurrency it seems) - lean on Npgsql connection pooling instead

…pected_version to get current version.

If current_version is null then it's < expected version, if > expected_version then we don't have as many records to sort in order to find MAX(current_version)
If using ExpectedVersion.Any then it will have to sort through all of the events.

… limit.

ExpectedVersion.Any should now perform as well as a given expected version.

…kpoints

…y collection of events but will eventually return the end of the stream, with a checkpoint.

…ption

…t has already been completed