Windows compatibility

[yyoon]

Since madb is not an application that uses Vanadium internally, it should be able to run on Windows as well. Android apps could be developed on Windows as well, so ideally madb should work on Windows fine.

There are a few known places where madb uses some platform specific code.

• getting the user home directory (should use user package in the go library, and not rely on $HOME variable)
• textutil library

[jxson]

Once we have basic windows support we should hook up some CI tests on http://www.appveyor.com/ (free for OSS like travis).

[yyoon]

Sure. That's good to know.