Patch.xs: SvUOK only returns true if the value is larger than an SvIV
Patch.pm: Fix typos in documentation
Added blame support
Added blame documentation
Changes: update
Silence msvc warnings and errors
Ensure test variables go out of scope.

On Windows the directories cannot be removed until libgit2 releases
them.
Changes: update
Raw.xs: fix 'value computed is not used' warnings