13 more tool manuals added

13 tool manuals have been added to the site over the past few days:

Duff-Norton:
   - 1 hoist manual

Grizzly Industrial:
   - 1 lathe manual
   - 2 mill manuals
   - 3 saw manuals
   - 1 shaper manual, 1 shaper manual update

Hitachi:
   - 1 impact wrench parts list
   - 1 saw manual, 1 saw parts list

Makita:
   - 2 planer manuals, 2 planer parts lists