Windows support

[MarekMalevic]

Removed dependency on uname (on Windows) and tar binaries.
Added 64 bit windows binary fetch to repack-postgres.sh script.
Tested on 64bit Windows 10.

[stevenschlansker]

fixes #12

[stevenschlansker]

Closeable extends AutoCloseable so this declaration is redundant, yeah?

[MarekMalevic]

removing

[stevenschlansker]

Thank you for the PR @MarekMalevic! I've left some comments, maybe take another pass at this? Then I'll do whatever final fixups are needed and merge it in.

[MarekMalevic]

I have fixed most of the issues and added comments to those I agree with but would better keep them not to break backward compatibility on Mac.

[stevenschlansker]

Thanks @MarekMalevic, I did the final bits and tested on Mac, could you please re-verify against Windows? If you are then satisfied with it, I can release 0.5.0 :)

[MarekMalevic]

I have tested your updates on Windows 10 and it works. The sooner 0.5.0 is released, the better. We are eagerly waiting to use pg9.5.2 ))

[soenkenils]

The latest version did not work for us on Windows 7 when run with administrator account:

The server must be started under an unprivileged user ID to prevent
possible system security compromises. See the documentation for
more information on how to properly start the server.

[MarekMalevic]

This is postgres limitation, it shall not be started under root/admin . From this perspective IMO the tests that use this library should not run under super user account.

[stevenschlansker]

I agree, tests do not care what user they run as -- if Postgres cannot run as admin, the tests will not run as admin, which I am totally okay with :)

[stevenschlansker]

Releasing 0.5.0 now, should be in Maven Central within the hour @MarekMalevic
Thanks for the contribution!