Full support for Win32 and many other enhancements

[katzer]

@tsahara @mattn @akiray03

As hinted in #1 here comes our PR

The PR adds full support for Win32 platform and various enhancements for posix platform. Honestly its more a rewrite than just a PR.

We would be happy to get some feedback and hope you will merge it. See the README for whats supported.

https://github.com/appPlant/mruby-process/tree/windows

[katzer]

@tsahara, @iij Any comments?

[tsahara]

Full support for Win32 platform is great. Nice work. But this PR has a few issues:

• You must not change license terms when you copy a large part of a file from other projects.
• It breaks *BSD support.
• The patch is too big to review at once. If it adds WIN32 support only, I can merge it without detailed review because it won't break anything works well currently.

[katzer]

@tsahara Thanks for your comments.

You must not change license terms when you copy a large part of a file from other projects.
It breaks *BSD support.

Both repos are under MIT license. What exactly do you mean and what needs to me modified?

The patch is too big to review at once. If it adds WIN32 support only, I can merge it without detailed review because it won't break anything works well currently.

OK, but how we can go from here? A merge without detailed review doesn't seem possible. On the the other side I want to avoid having a second mruby-process mgem. We've added lots of tests and ci integration to make sure that everything works as expected.

In case of questions, suggestions and future support we're open to incorporate. We had to touch all the files so a PR which adds just a file or a method isn't possible.