Error Handling for Window10 without CygWin

[tobozo]

Added an Exception handling to the offending urlretrieve() call for the issue #108

It's not really a fix but the failure message is much more elegant than the initial stack trace as it hints at the solution to the setup problem rather than confusing the user into Windows problems.

[me-no-dev]

Nice! Thanks, though finding what is causing this is much preferred :) I have not been able to reproduce it here.

[tobozo]

After some investigation the problem seems to be in urllib

• python 2.7x
• win10
• no CYGWIN_NT in PATH/ENV (using git shell from Git For Windows)

Workaround:

• #> pip install requests

• add "import requests" in get.py

• use the following code when urlretrieve raises an exception :

          r = requests.get(url)
          f = open(local_path, 'wb')
          f.write(r.content)
          f.close()
  

I can submit a PR if this approach is verified to work on another machine