Reinsert function retrieve_kb_resolver
Reinsert function retrieve_kb_resolver

Function retrieve_kb_resolver (services/views.py) was removed while
cleaning up the code. Because this function is used to retrieve the
scan images of articles, it was reinserted.

UUDigitalHumanitieslab/texcavator,msassmann/texcavator,msassmann/texcavator,msassmann/texcavator,UUDigitalHumanitieslab/texcavator,UUDigitalHumanitieslab/texcavator,msassmann/texcavator