Removing the obsolete promotions for reductions

[kimikage]

The current codebase has no compatibility with Julia v0.6, because the syntax for parametric methods has been fully changed to the current (i.e.where) style. I think the backporting is not easy. Therefore, the following codes are no longer useful.

FixedPointNumbers.jl/src/FixedPointNumbers.jl

Lines 157 to 169 in 70ae1d6

	if isdefined(Base, :r_promote)
	# Julia v0.6
	Base.r_promote(::typeof(+), x::FixedPoint{T}) where {T} = Treduce(x)
	Base.r_promote(::typeof(*), x::FixedPoint{T}) where {T} = Treduce(x)
	Base.reducedim_init(f::typeof(identity),
	op::typeof(+),
	A::AbstractArray{T}, region) where {T <: FixedPoint} =
	Base.reducedim_initarray(A, region, zero(Treduce))
	Base.reducedim_init(f::typeof(identity),
	op::typeof(*),
	A::AbstractArray{T}, region) where {T <: FixedPoint} =
	Base.reducedim_initarray(A, region, oneunit(Treduce))
	else

Removing the obsolete promotions may help improve the promotion rules. For example, the current promotions use const Treduce = Float64, but I don't think it is always pretty good. (I can expect the negative impact of the braking change to be significant, though.)
Moreover, it ostensibly improves the code coverage.