fixes #261 (#262)

* fixes #261

* removed docstring

Author: yakir12

src/OffsetArrays.jl

@@ -764,6 +764,7 @@ See also [`center`](@ref OffsetArrays.center).
 """
 centered(A::AbstractArray, cp::Dims=center(A)) = OffsetArray(A, .-cp)
 
+centered(A::AbstractArray, i::CartesianIndex) = centered(A, Tuple(i))
 
 ####
 # work around for segfault in searchsorted*

test/runtests.jl

@@ -2537,6 +2537,13 @@ end
         @test parent(Aoo) === A # there will be only one OffsetArray wrapper
         @test Aoo.offsets == (-2, -2)
         @test Aoo[0, 0] == 5
+
+        A = reshape(collect(1:9), 3, 3)
+        Aoo = OffsetArrays.centered(A, CartesianIndex(2,2))
+        c = (0,0)
+        i = CartesianIndex(c...)
+        @test Aoo[i] == Aoo[c...]
+
     end
 end