Add ReshapedArray

[dlfivefifty]

@TSGut This should fix one of your bugs:

julia> A = BandedMatrix(0 => 2π * (-1).^(1:∞))
∞×∞ BandedMatrix{Float64,ApplyArray{Float64,2,typeof(*),Tuple{Array{Float64,2},ApplyArray{Float64,2,typeof(vcat),Tuple{ApplyArray{Float64,2,typeof(hcat),Tuple{Zeros{Float64,2,Tuple{Base.OneTo{Int64},Base.OneTo{Int64}}},InfiniteArrays.ReshapedArray{Float64,2,BroadcastArray{Float64,1,typeof(*),Tuple{Float64,BroadcastArray{Int64,1,typeof(^),Tuple{Int64,InfUnitRange{Int64}}}}},Tuple{Int64,InfiniteArrays.Infinity},Tuple{}}}}}}}},OneToInf{Int64}} with indices OneToInf()×OneToInf():
 -6.28319   ⋅         ⋅       …  
   ⋅       6.28319    ⋅          
   ⋅        ⋅       -6.28319     
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   ⋅        ⋅         ⋅          
   ⋅        ⋅         ⋅       …  
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  ⋮                           ⋱