Error with cx_freeze and xlwings as standalone frozen version with fibonacci tutorial

Compiling it with cx_Freeze fails on these lines:

```
# Hack to find pythoncom.dll - needed for some distribution/setups
# E.g. if python is started with the full path outside of the python path, then it almost     certainly fails
cwd = os.getcwd()
os.chdir(sys.exec_prefix)
import win32api
os.chdir(cwd)
```

see: http://stackoverflow.com/q/27871394/918626
