51 more mower manuals added

51 more lawn mower owner's manuals, parts lists, and service manuals were added recently:

- Bad Boy: 1 mower parts list
- Brute: 1 mower manual
- Gravely: 2 mower parts lists
- Husqvarna: 1 mower manual, 4 mower parts lists
- John Deere: 1 mower manual, 8 mower quick reference guides
- Murray: 1 mower parts list
- Poulan Pro: 8 mower parts lists
- Quelle: 1 mower parts list
- Red Hawk: 1 mower manual
- Scag: 1 mower manual, 1 mower parts list
- Snapper: 3 mower manuals, 4 mower parts lists
- Southland: 2 mower manuals, 1 mower parts list
- Toro: 3 mower manuals, 2 mower parts lists, 2 mower service manuals
- Worldlawn: 1 mower manual, 2 mower parts lists