Add example for query parameters
Remove need to use Variant for query parameters

Apply fix suggested by @luminousone in
https://github.com/pszturmaj/ddb/issues/34
Merge pull request #33 from pinver/fix33

Sync statement to the backend when an error is received in ...
Merge pull request #35 from jongiddy/variant

Remove need for Variant in query parameters
Merge branch 'master' into master_patched