See issue 47.

Thanks to Andreas Schwab.

This way we can add a 0.0.0 for the v1 branch.

Conflicts:
	Changelog
	SConstruct

I previously used the wrong variable (_ARCH64EL_ instead of
__ARCH64EL__).

BUG=33

Thanks to Elan Ruusamäe and Milan Bouchet-Valat.

The current version doesn't allow to switch configurations yet.

BUG=42

Conflicts:
	Changelog
	src/double-conversion.cc
	src/double-conversion.h

BUG=41

Thanks to Chris Bracken.
BUG=37

Also disable a test that was triggering a compiler bug in Visual
Studio 2012. The disabled tests were only sanity checks and weren't
testing the double-conversion library.

Inside double-conversion this function is only called with values that will
never trigger this bug.

BUG: 33.

Patch from Mike Homney (Mozilla Foundation).

Fixes issue 26.