Support non-UnitRange based ranges

[dlfivefifty]

No description provided.

[codecov]

Codecov Report

Merging #94 (72e249f) into master (223cb15) will decrease coverage by 0.52%.
The diff coverage is 94.02%.

@@            Coverage Diff             @@
##           master      #94      +/-   ##
==========================================
- Coverage   86.04%   85.52%   -0.53%     
==========================================
  Files          10       10              
  Lines        1025     1043      +18     
==========================================
+ Hits          882      892      +10     
- Misses        143      151       +8     

Impacted Files	Coverage Δ
src/BlockBandedMatrices.jl	33.33% <ø> (ø)
src/BlockSkylineMatrix.jl	92.53% <ø> (-2.58%)	⬇️
src/linalg.jl	80.00% <88.88%> (-1.25%)	⬇️
src/BandedBlockBandedMatrix.jl	86.32% <92.68%> (+0.32%)	⬆️
src/AbstractBlockBandedMatrix.jl	72.05% <100.00%> (+4.26%)	⬆️
src/broadcast.jl	79.01% <100.00%> (+0.47%)	⬆️
src/interfaceimpl.jl	93.87% <100.00%> (-1.87%)	⬇️
... and 2 more

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