15 more tool manuals added

15 more tool manuals and parts lists have been added recently, for the following tools:

Central Pneumatic:
   - 1 grease gun manual

DeWalt:
   - 1 air compressor manual, 1 air compressor parts list
   - 1 cut-off tool manual, 1 cut-off tool parts list
   - 1 grinder manual

Hitachi:
   - 3 saw manuals

Makita:
   - 2 saw manuals, 1 saw parts list

Milwaukee:
   - 1 multimeter manual, 2 multimeter parts lists