tests pass, incorporates new storage

[dlfivefifty]

@mdavezac This incorporates the changes of #12

and tests now pass.

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@a158e88). Click here to learn what that means.
The diff coverage is 73.46%.

@@           Coverage Diff            @@
##             master     #18   +/-   ##
========================================
  Coverage          ?   48.4%           
========================================
  Files             ?       8           
  Lines             ?     849           
  Branches          ?       0           
========================================
  Hits              ?     411           
  Misses            ?     438           
  Partials          ?       0

Impacted Files	Coverage Δ
src/interfaceimpl.jl	62.5% <100%> (ø)
src/AbstractBlockBandedMatrix.jl	48.38% <100%> (ø)
src/triblockbanded.jl	52.38% <42.85%> (ø)
src/BandedBlockBandedMatrix.jl	60.37% <70.96%> (ø)
src/linalg.jl	32.66% <72.72%> (ø)
src/broadcast.jl	51.97% <81.81%> (ø)

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