Config hotfix

[nwittler]

Fixed some of the new classes that didn't play nice with config files.

[codecov-io]

Codecov Report

Merging #41 (032fbb1) into dev (6147d84) will decrease coverage by 0.02%.
The diff coverage is 37.50%.

@@            Coverage Diff             @@
##              dev      #41      +/-   ##
==========================================
- Coverage   46.95%   46.92%   -0.03%     
==========================================
  Files          35       35              
  Lines        4453     4492      +39     
==========================================
+ Hits         2091     2108      +17     
- Misses       2362     2384      +22     

Impacted Files	Coverage Δ
c3/experiment.py	55.82% <10.00%> (-2.34%)	⬇️
c3/libraries/envelopes.py	36.87% <19.60%> (-0.48%)	⬇️
c3/c3objs.py	79.56% <40.00%> (-2.46%)	⬇️
c3/system/chip.py	75.10% <83.33%> (+0.10%)	⬆️
c3/generator/devices.py	71.69% <100.00%> (+0.05%)	⬆️
c3/generator/generator.py	93.22% <100.00%> (+0.23%)	⬆️
c3/parametermap.py	91.97% <100.00%> (+0.10%)	⬆️
c3/signal/pulse.py	91.93% <100.00%> (ø)
c3/system/model.py	79.71% <100.00%> (+0.19%)	⬆️

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