History handling

Removed the funtions from lims_utils, put them in genologics.entities , see PR https://github.com/SciLifeLab/genologics/pull/64/


Changed the calls to these functions to use the object. 

Added error handling to a small thing that broke once, when the History object failed to be created properly. 
aha ok now I see that you're only removing the ```__init__.py``` "script", sorry didn't see it.

Ok then, even though still looks a bit strange.