Added db:query_by_example unit tests
The unittests currently only cover the basic operation and a very simple
combined query. I am confident about the method, but if other often used
screnarios are met, they should be added.
Added db:query_by_example()
This function will query for a prototype in a database.
Incorporated some optimizations
Changed some things according to Vadi's comments to commit
keneanung/mudlet-lua@5933961dad2a759001dadd4a388a3f674ad15a3a
Changes to unittests for query_by_example()
More changes according to comments in keneanung/mudlet-lua@5933961dad2a759001dadd4a388a3f674ad15a3a
Merge pull request #3 from keneanung/master

New DB function query_by_example contributed by Keneanung