Broadcast numbers over vec(data)

[jishnub]

On master

julia> B = BandedMatrix(1=>Float64.(1:3000));

julia> @btime $B .* 2;
  8.533 μs (3 allocations: 23.59 KiB)

This PR

julia> @btime $B .* 2;
  2.560 μs (7 allocations: 23.77 KiB)

[codecov]

Codecov Report

Base: 80.55% // Head: 80.58% // Increases project coverage by +0.03% 🎉

Coverage data is based on head (6bd74a8) compared to base (9a573b1).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #304      +/-   ##
==========================================
+ Coverage   80.55%   80.58%   +0.03%     
==========================================
  Files          23       23              
  Lines        3270     3276       +6     
==========================================
+ Hits         2634     2640       +6     
  Misses        636      636              

Impacted Files	Coverage Δ
src/generic/broadcast.jl	90.04% <100.00%> (+0.09%)	⬆️

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