[MRG] Add tests for output formats and parser kwargs

[vinayak-mehta]

For #110.

[codecov-io]

Codecov Report

Merging #126 into master will increase coverage by 10.52%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master     #126       +/-   ##
===========================================
+ Coverage   73.76%   84.28%   +10.52%     
===========================================
  Files          12       12               
  Lines        1239     1203       -36     
  Branches      293      288        -5     
===========================================
+ Hits          914     1014      +100     
+ Misses        281      145      -136     
  Partials       44       44

Impacted Files	Coverage Δ
camelot/image_processing.py	85.71% <ø> (+22.82%)	⬆️
camelot/utils.py	81.38% <ø> (+19.54%)	⬆️
camelot/parsers/lattice.py	90.9% <0%> (+10.79%)	⬆️
camelot/core.py	86.41% <0%> (+12.83%)	⬆️

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