Win64 installation

Several improvements for win64 installation:
- additional binary utils for luarocks/fs
- path to binary utils changed
- x64 platform added
- cmake.cmd to add -G "NMake Makefiles" to cmake command line
- additional defines (_WIN32, _WINDOWS) and libluajit import for different rocks to compile

tested with VS2013 x64 and rocks:
without any changes
  paths
  cwrap
  torch
  sys
  nn
  qtlua
  xlua
with ';' changed to '&&' to separate build commands 
  optim
  json
  unsup
  dp
  gm