Sample of bulk insert

[josejuanmontiel]

Hi!

• What exactly is changing? In jobber.go the writeResult change to consider interate the origin source and batch to the target database using new methods of the backend that use SQL with insert multlples rows. It hence that pass a slice to the backend method and there split acording the batch size.

• why? Some bulks of thousands of lines could speedup if some bulk "backend" methods its used.

• and how it helps? By configuration, could speedup the velocity of insert in target database.

• The overall architecture.

1. In the main loop, organize the iteration from origin to append the result to send to backend.
2. The backend build SQL in inserts with multiple lines.

TODO:

1. Move the batch size to configuration.
2. If pull 21 it's merged before, add some test

[knadh]

Sorry for missing this PR. The project is being rewritten and rebranded (#31) with a long pending to-do (replacing the Machinery lib). Once this is done in the coming couple of weeks, if you are still interested, we can re-look at this. Closing the PR for now. Thank you.