element-wise operations not defined

[neveritt]

Current version:

julia> using Polynomials

julia> p1 = Poly([1, 2])
Poly(1 + 2x)

julia> p2 = Poly([3, 1.])
Poly(3.0 + x)

julia> p = [p1, p2]
2-element Array{Polynomials.Poly{Float64},1}:
Poly(1.0 + 2.0x)
Poly(3.0 + x)   

julia> q = [3,p1]
2-element Array{Any,1}:
3            
Poly(1 + 2x)

julia> 3p
ERROR: MethodError: `.*` has no method matching .*(::Int64,
::Polynomials.Poly{Float64})
Closest candidates are:
.*(::Real, ::OrdinalRange{T,S})
.*(::Real, ::FloatRange{T<:AbstractFloat})
.*(::Real, ::LinSpace{T<:AbstractFloat})
...
in .* at arraymath.jl:120
in * at abstractarraymath.jl:54

Dot product is not defined between Numbers and Polys.
It would be convenient to have such a feature.

Promotion rule from Numbers to Polys is not defined either.