Add windows support

[nighi]

I could't run colour-runner because of missing module _curses (needed by blessings) for windows.
It seems like blessings doesn't support windows, but its fork blessed does.

Changing this line in result.py

from blessings import Terminal

to

from blessed import Terminal

resolves the issue for me. (no intensive testing, yet)

Clould maybe also resolve #15.