[RFC][win32] bzr.exe -- launcher for bzr script

[Alexander Belchenko]

I found the bug. It was caused by exemaker itself. No need to change bzr 
script.

Here bug description:

When exemaker bind python script with exe launcher it add at the 
beginning of script these lines:

#!path/to/python.exe
import site

Becasue `import site` statement appeared before docstring of script then 
variable __doc__ take the value of None.

--
Alexander