Implement eltype for Poly **types**

Implemented `eltype` for `Poly` **types** and added tests.

Fixes #67.

Author: Arda Aytekin

src/Polynomials.jl

@@ -115,6 +115,7 @@ convert{T, S<:Number,n}(::Type{Poly{T}}, x::Array{S,n}) = map(el->convert(Poly{p
 promote_rule{T, S}(::Type{Poly{T}}, ::Type{Poly{S}}) = Poly{promote_type(T, S)}
 promote_rule{T, S<:Number}(::Type{Poly{T}}, ::Type{S}) = Poly{promote_type(T, S)}
 eltype{T}(::Poly{T}) = T
+eltype{T}(::Type{Poly{T}}) = T
 
 """
 

test/runtests.jl

@@ -196,3 +196,9 @@ p1 = Poly([1,2])
 p2 = convert(Poly{Int64}, p1)
 p2[3] = 3
 @test p1[3] == 3
+
+## eltype of a Poly type
+types = [Int, UInt8, Float64]
+for t in types
+  @test t == eltype(Poly{t})
+end