21 more tool manuals added

21 more tool manuals and parts lists have been added to the site recently:

Delta:
   - 3 grinder manuals
   - 9 sander manuals

DeWalt:
   - 3 drill manuals, 2 drill parts lists

Porter-Cable:
   - 1 grinder manual

Ryobi:
   - 3 battery pack manuals