Fix inconsistency with Where and And on SQL builder.

Fix race condition when cached statements where closed while still in use

Make query error report errors on Query and QueryRow.

Drafting query logger and db config

Fix update nil column

Fix panic on SetLogger

Improve column guesses when inserting values

Bump up versions for testing.

Moving adapter benchmarks to db-bench

Moving adapter benchmarks to https://github.com/upper/db-bench in order to make it easy to compare upper-db against other database abstractions

Add hasIsZero() interface to prevent  runtime errors

Add column schema guessing based on map/struct values

Play it nice with Go guru

Issue 237