added .csv image loading utils

[williamFalcon]

enable image classification prediction from a str assumed to point to a dir

[codecov]

Codecov Report

Merging #118 (dda2834) into master (0c160a2) will increase coverage by 0.45%.
The diff coverage is 83.33%.

@@            Coverage Diff             @@
##           master     #118      +/-   ##
==========================================
+ Coverage   86.67%   87.12%   +0.45%     
==========================================
  Files          49       49              
  Lines        1546     1554       +8     
==========================================
+ Hits         1340     1354      +14     
+ Misses        206      200       -6     

Flag	Coverage Δ
unittests	87.12% <83.33%> (+0.45%)	⬆️

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Impacted Files	Coverage Δ
flash/vision/classification/data.py	85.33% <71.42%> (+4.38%)	⬆️
flash/core/model.py	95.69% <100.00%> (+0.24%)	⬆️

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