Win build

[kkirstein]

• add symbol definitions for Windows build
• fix function signature for Windows in remutex package
• add build instruction for Windows to Readme

[kkirstein]

@aldanor I just created a pull request with the Windows-enabled version. I added some build instructions to the Readme. I also had a short look at appveyor, looks like a good option, although I have no experience with CI from the cloud.
As I will be on vacation for the rest of the week, please don't expect any answers from me during the next days, I will take a closer look at appveyor next week.

[aldanor]

@kkirstein

Thanks a lot for the PR! I won't have time to look at it in detail till weekend but it looks good from the first glance -- although I have no way of testing it actually works on Windows right now other than taking your word on it -- would be really great to try and set up a CI build for it.

I have no experience with Appveyor but it looks reasonable. Maybe you could take a look at PyTables build? See PR here: PyTables/PyTables#426

As for MSVC interoperability, it looks like there's some very recent ongoing work going upstream, see here for more details:

• Rust, Windows, and MSVC rust-lang/rfcs#1061
• Initial MSVC support for the compiler rust-lang/rust#25350

Ideally, we'd want to support both mingw and msvc builds, if possible at all.

[kkirstein]

@aldanor Thanks, for pointing to the discussions on rust-lang!

[aldanor]

@kkirstein You're welcome! By the way, I've noticed that many rust-lang repos were set up for appveyor builds about a week ago -- see, for instance, rust-lang/regex@1be2fee -- maybe that could be a good starting point.

Good call with #[inline], too.

[aldanor]

Closed in favor of #7.