Add support for cracking PDF files

Signed-off-by: Dhiru Kholia <dhiru@openwall.com>
Initial GPU support for KeePass (need more work, v1, nvidia kernels, etc)
keepass fix
Give credit to Sumatra PDF and MuPDF
keepass finalized
dmg: make _memmem() static
Makefile updates (keepass)
Merge pull request #16 from kholia/pdf

Add support for cracking PDF files (Dhiru Kholia)
Uhhh...forgot nvidia keepass kernels