64bit compilation

Fixed compilation on Windows 7 64. Steps:
To compile I use a Windows 7 virtual machine.
- Installed python 3.3 (Python 3.4 is broken with cx_freeze)
- Install pywin32, cython, msgpack and cx_freeze from
http://www.lfd.uci.edu/~gohlke/pythonlibs/
- Install activeperl (I used ActivePerl-5.16.3.1604-MSWin32-x64-298023)
- Download openssl source 1.0.1g.
- Install Windows 7 SDK (python is compiled with these):
http://www.microsoft.com/en-us/download/details.aspx?id=8279
- Open SDK Console window and execute (extracted from cython page):
```
set DISTUTILS_USE_SDK=1
setenv /x64 /release (if you are building to x64)
```
- Install openssl
(http://developer.covenanteyes.com/building-openssl-for-visual-studio/),
in openssl dir do:
```
perl Configure VC-WIN64A --prefix=C:\OpenSSL-Win64
ms\do_win64a
nmake -f ms\nt.mak
nmake -f ms\nt.mak install
```
- copy scripts/attic to attic.py in source root.
- cd to attic dir and generate instalable:
```
python setupwin.py build
python setupwin.py bdist_msi
```
- msi is in dist folder.