Add non-variadic versions of Buffer::set_min() and Buffer::contains()
Add non-variadic versions of Buffer::set_min() and Buffer::contains()

This makes Python bindings much easier to write.

Trass3r/Halide,Trass3r/Halide,Trass3r/Halide,Trass3r/Halide,Trass3r/Halide,Trass3r/Halide,Trass3r/Halide