Fix MulFun deprecation warnings (using Compat)

Author: carlobaldassi

REQUIRE

@@ -3,3 +3,4 @@ julia 0.4
 WoodburyMatrices 0.1.5
 Ratios
 AxisAlgorithms
+Compat 0.8.0

src/Interpolations.jl

@@ -32,6 +32,7 @@ export
     # extrapolation/extrapolation.jl
     # scaling/scaling.jl
 
+using Compat
 using WoodburyMatrices, Ratios, AxisAlgorithms
 
 import Base: convert, size, getindex, gradient, scale, promote_rule, ndims, eltype

src/b-splines/indexing.jl

@@ -82,7 +82,7 @@ end
 function getindex_return_type{T,N,TCoefs,IT<:DimSpec{BSpline},GT<:DimSpec{GridType},Pad}(::Type{BSplineInterpolation{T,N,TCoefs,IT,GT,Pad}}, argtypes)
     Tret = eltype(TCoefs)
     for a in argtypes
-        Tret = Base.promote_op(Base.MulFun, Tret, a)
+        Tret = Base.promote_op(@functorize(*), Tret, a) # the macro is used to support julia 0.4
     end
     Tret
 end

src/gridded/indexing.jl

@@ -143,7 +143,7 @@ end
 function getindex_return_type{T,N,TCoefs,IT<:DimSpec{Gridded},K,P}(::Type{GriddedInterpolation{T,N,TCoefs,IT,K,P}}, argtypes)
     Tret = TCoefs
     for a in argtypes
-        Tret = Base.promote_op(Base.MulFun, Tret, a)
+        Tret = Base.promote_op(@functorize(*), Tret, a) # the macro is used to support julia 0.4
     end
     Tret
 end