Test: Make SQL query to verify created/updated data is persisted

[landonreed]

Per @evansiroky's comment in #133, we might should be checking the database independently of the create/update result returned by JDBCTableWriter. We would use a SQL query to do this, but we do need to consider how to user a shared connection to ensure that the data is up to date following the executed statements.

gtfs-lib/src/test/java/com/conveyal/gtfs/loader/JDBCTableWriterTest.java

Lines 84 to 85 in 1a3de7d

	// make sure saved data matches expected data
	assertThat(createdFeedInfo.feed_publisher_name, equalTo(publisherName));