Fixes #12

[justinpinkney]

If using a dag net don't create gpuArray (fixes #12)

Also extracts application of pnet to network strategy object.

[codecov-io]

Codecov Report

Merging #13 into master will decrease coverage by 0.37%.
The diff coverage is 94.44%.

@@            Coverage Diff             @@
##           master      #13      +/-   ##
==========================================
- Coverage   72.29%   71.91%   -0.38%     
==========================================
  Files          15       15              
  Lines         296      292       -4     
==========================================
- Hits          214      210       -4     
  Misses         82       82              

Impacted Files	Coverage Δ
code/mtcnn/+mtcnn/+util/DagNetworkStrategy.m	94.44% <90.00%> (-5.56%)	⬇️
code/mtcnn/+mtcnn/+util/DlNetworkStrategy.m	85.71% <100.00%> (+2.38%)	⬆️
code/mtcnn/+mtcnn/Detector.m	92.85% <100.00%> (ø)
code/mtcnn/+mtcnn/proposeRegions.m	100.00% <100.00%> (+3.12%)	⬆️

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