Fat gem support for windows.
Update to the latest rake-compiler (pre-)release.
Ignore the pkg dir.
Ignore rugged binaries in lib and subfolders.
Allow specifying the path to libgit2, but fallback to the included version.
Fix an issue with ENV vars I had when running the 'sh' helper on 1.9.3.
Rename embedded_clean to clean:libgit2.