KeeChallenge v1.5

Thanks to Robert Claypool for his numerous contributions to clean up and improve Keechallenge

• Migrated to Github from Sourceforge.
• Changed recovery mode to better support variable length challenges.
• MD5 Checksum: 80A7EADA1C86332B3F91B75E4E8317F0
• SHA1 Checksum: 06C3B96ED674E5617F0DAFF5101E23EF95AFF71C