Windows support

[scholer]

I wanted to be able to use this great command line tool on Windows.

I've added experimental Windows support by doing the following:

• Using entry_points instead of scripts in setup.py,
• Moved cli script inside package,
• Catching windows-specific exceptions in tabview.py, and converting '\r\n' strings to '\n' when reading the help file.
• Added note on Windows curses installation to README.
• When I used F1 to display key bindings, I noticed that the README file has been moved. I installed using pip install -e ., so someone should verify whether this is also an issue in other cases.

PS: Thanks for creating tabviewer!

[firecat53]

Nice...I have nothing to test it on so I'll have to take your word for it :) But...if you can rework the tests so they all pass with your modifications that would be great.