[MRG] Add ghostscript fix for windows

[vinayak-mehta]

#121

[codecov-io]

Codecov Report

Merging #124 into master will decrease coverage by 0.07%.
The diff coverage is 54.54%.

@@            Coverage Diff             @@
##           master     #124      +/-   ##
==========================================
- Coverage   73.84%   73.76%   -0.08%     
==========================================
  Files          12       12              
  Lines        1231     1239       +8     
  Branches      292      293       +1     
==========================================
+ Hits          909      914       +5     
- Misses        279      281       +2     
- Partials       43       44       +1

Impacted Files	Coverage Δ
camelot/parsers/lattice.py	80.11% <54.54%> (-0.84%)	⬇️

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