Lua binding to FileEncrypt

• Test passed on WinXP/Win2k3 (x32) VC2010Express/MinGW
• Test passed on Win2k8(x64) MinGW W64
• Test passed on Win2k12(x64) MinGW W64/VC2012Express
• Test passed on Linux Mint 15 (x32)
• Test passed on Linux Debian 3.9.5 x86_64 GNU/Linux