Additional (optional) parameters added to gaussian blur

[markdicksonjr]

SigmaY and BorderType were using default values within gaussianBlur. They can now be customized

[codecov-io]

Codecov Report

Merging #626 into master will increase coverage by 0.04%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #626      +/-   ##
==========================================
+ Coverage   57.23%   57.27%   +0.04%     
==========================================
  Files          32       32              
  Lines        4043     4047       +4     
  Branches       30       30              
==========================================
+ Hits         2314     2318       +4     
  Misses       1729     1729

Impacted Files	Coverage Δ
src/Matrix.cc	56.61% <100%> (+0.08%)	⬆️

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