Added option to change default path sep character.

[jacobwilliams]

Fixes #253

[codecov-io]

Codecov Report

Merging #254 into master will increase coverage by 0.02%.

@@            Coverage Diff             @@
##           master     #254      +/-   ##
==========================================
+ Coverage   87.44%   87.47%   +0.02%     
==========================================
  Files           3        3              
  Lines        3219     3225       +6     
==========================================
+ Hits         2815     2821       +6     
  Misses        404      404

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