Extra tests

Make some extra tests, to cover some more "ground"

Minor speed changes

I checked and saw some improvements to squeeze the last drop of "slow" out of it. All is left now is pure speed :-)

1.0.0

After a long period of testing, it was time to make this into a final solution.
It's fast and can get the records in a sorted order now (by key: calling GetAllSorted instead of GetAll)
If you need to sort in a different way, see the example.