[Windmill-dev] pending windmill bin changes

[Mikeal Rogers]

When we moved the windmill bin python file last week we hit a lot of  
issues from different people. I'm moving some stuff around one last  
time to avoid these problems in the future.

Now there are two files
1) windmill/bin/windmill_bin.py

Valid python file with `if __name__ == "__main__":` calling that  
modules main() function.

2) windmill/bin/windmill

A command line executable file installed by setuptools. This file  
imports windmill_bin from the installed windmill module and calls  
it's main() function.

-Mikeal