five/15 mismatch typo

Original: 
>  Members holding five percent (15%) 
Proposed change:
>  Members holding fifteen percent (15%) 
Merge pull request #1 from petertodd/master

Remove .DS_Store junk
Merge pull request #2 from cwkoss/patch-1

five/15 mismatch typo
Reference Satoshi's PGP key by full fingerprint

32-bit key ID's are too short to be secure.