Fix failure on 1.0 by adding Compat dependency

Author: andreasnoack

REQUIRE

@@ -1 +1,2 @@
 julia 0.6
+Compat 0.47

src/NaNMath.jl

@@ -1,6 +1,8 @@
 __precompile__()
 module NaNMath
 
+using Compat
+
 const libm = Base.libm_name
 
 for f in (:sin, :cos, :tan, :asin, :acos, :acosh, :atanh, :log, :log2, :log10,
@@ -57,7 +59,7 @@ function sum(x::AbstractArray{T}) where T<:AbstractFloat
     end
 
     if isnan(result)
-        Base.warn_once("All elements of the array, passed to \"sum\" are NaN!")
+        Compat.@warn "All elements of the array, passed to \"sum\" are NaN!"
     end
     return result
 end

test/runtests.jl

@@ -1,5 +1,5 @@
 using NaNMath
-using Base.Test
+using Compat.Test
 
 @test isnan(NaNMath.log(-10))
 @test isnan(NaNMath.log1p(-100))