Revert "Merge pull request #15 from SlikNL/and-where-in-empty"

This reverts BC break

This reverts commit 9f419b91cbc0421ccec0691fa22a8620d0e11093, reversing
changes made to b43bf2eead3e56e5b23aab65df0d24436443a376.
Create README
Merge pull request #18 from denis-sokolov/patch-1

Create README
Readme: improve the wording for the change on dev
Warn users about andWhereIn idiosyncrasy, see #15
Merge pull request #19 from denis-sokolov/patch-1

Readme: improve the wording for the change on dev
Merge pull request #20 from denis-sokolov/patch-2

Warn users about andWhereIn idiosyncrasy, see #15
Merge pull request #1 from drak/master

Restore BC!