doc,test: enable recursive file watching in Windows

Recursive file watching is supported by libuv since 1.7.0. Refer
https://github.com/nodejs/node/blob/master/deps/uv/ChangeLog#L126. This
patch notes that in the docs and enables testing this feature. It also
adds proper TAP plugin parsable message for other platforms.

PR-URL: https://github.com/nodejs/node/pull/2649
Fixes: https://github.com/nodejs/node/issues/375


Reviewed-By: rvagg - Rod Vagg <rod@vagg.org>
Reviewed-By: silverwind - Roman Reiss <me@silverwind.io>