unwrap rawview(::channelview) with one reshape reinterpret

[johnnychen94]

This does not fix #174 but could be potentially a good change by eliminating one mapped array wrapper.

[codecov[bot]]

Codecov Report

Merging #175 (0eb4993) into master (ff7afc0) will decrease coverage by 0.44%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #175      +/-   ##
==========================================
- Coverage   62.26%   61.81%   -0.45%     
==========================================
  Files          10       10              
  Lines         583      584       +1     
==========================================
- Hits          363      361       -2     
- Misses        220      223       +3     

Impacted Files	Coverage Δ
src/ImageCore.jl	73.33% <100.00%> (+0.91%)	:arrow_up:
src/show.jl	58.33% <0.00%> (-12.51%)	:arrow_down:

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