Updated link

As the [hiredis README](https://github.com/antirez/hiredis/blob/master/README.md) shows, the project has moved to https://github.com/redis/hiredis.
Add cc flags for solaris (really SmartOS) so that hiredis can be used on Nodejitsu
Merge pull request #41 from randomfactor/master

Fix for use on Nodejitsu
Merge pull request #35 from mcandre/master

Updated hiredis link in README
Build on Windows using MS Visual Studio