juju-core tests now running on Windows

[Gabriel Samfira]

Hello folks,


Thanks to Bogdan Teleaga's great work, juju-core tests on master branch 
now pass on windows. There are a number of skipped tests at the moment, 
which still need to be fixed, but starting now, we can at least avoid 
adding new code and tests that do not work on windows.

The bug report with the skipped tests is here:

https://bugs.launchpad.net/juju-core/+bug/1403084

I have written a short article on setting up a windows testing 
environment. The process should be relatively painless, but I do 
encourage you to make a snapshot once you have everything set up. The 
guide can be found here:

http://wiki.cloudbase.it/juju-testing

This can be set up on top of KVM, with around 1-1.5 GB of RAM. Of course 
more is better if you can spare it. If you find any bugs with the howto, 
of if there is anything that is missing, please let me know.

I would really appreciate it if everyone would test on windows before 
pushing a change. If the code you plan on merging is not meant to run on 
windows, please add proper build constraints.

Thanks Bogdan, and thank you guys for the great reviews that got the 
tests running :).


Cheers,
Gabriel