Merge branch 'dev' into 'release'

ndf/ndf.go

ndf/ndf_test.go

rateLimiting/bucket.go

rateLimiting/bucket_test.go

region/bin.go

region/bin_test.go

region/country.go

region/odering_test.go

region/ordering.go

region/permute.go

region/permute_test.go

region/weights_test.go