Add logging for material indexing
Add logging for material indexing

In order to track down issues it's helpful to know when an indexing run
actually starts and what materials it is working with.

thecoolestguy/ilios,stopfstedt/ilios,stopfstedt/ilios,ilios/ilios,Trott/ilios,Trott/ilios,ilios/ilios,dartajax/ilios,thecoolestguy/ilios,dartajax/ilios