updates install docs with instructions on how to import MeSH
updates install docs with instructions on how to import MeSH

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