added model source parameter; fixes #56

[codecov-commenter]

Codecov Report

Merging #57 (3605900) into master (32236ee) will increase coverage by 0.92%. The diff coverage is 92.38%.

@@            Coverage Diff             @@
##           master      #57      +/-   ##
==========================================
+ Coverage   74.64%   75.57%   +0.92%     
==========================================
  Files          13       13              
  Lines        1266     1310      +44     
  Branches      244      250       +6     
==========================================
+ Hits          945      990      +45     
- Misses        279      280       +1     
+ Partials       42       40       -2     

Flag	Coverage Δ
unittests	75.57% <92.38%> (+0.92%)	:arrow_up:

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Impacted Files	Coverage Δ
thingsvision/vision.py	64.68% <ø> (ø)
thingsvision/model_class.py	76.31% <89.61%> (+3.67%)	:arrow_up:
thingsvision/custom_models/alexnet_ecoset.py	100.00% <100.00%> (+7.14%)	:arrow_up:
thingsvision/custom_models/custom.py	100.00% <100.00%> (ø)
thingsvision/custom_models/resnet50_ecoset.py	100.00% <100.00%> (+7.69%)	:arrow_up:
thingsvision/custom_models/vgg16bn_ecoset.py	100.00% <100.00%> (+7.69%)	:arrow_up:

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[hahahannes]

dont merge yet :) I need to remove the backend parameter