Added Fresnel integrals #398

[curio-sitas]

Added Fresnel integrals from https://github.com/kiranshila/FresnelIntegrals.jl. As suggested in #398

Added 3 functions with docs :

• Fresnelc(z)
• Fresnels(z)
• Fresnnel(z) = (Fresnelc(z),Fresnels(z))

Tests were added too

[codecov[bot]]

Codecov Report

Merging #407 (08ed9e9) into master (36c547b) will increase coverage by 0.12%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #407      +/-   ##
==========================================
+ Coverage   93.63%   93.76%   +0.12%     
==========================================
  Files          12       13       +1     
  Lines        2767     2822      +55     
==========================================
+ Hits         2591     2646      +55     
  Misses        176      176              

Flag	Coverage Δ
unittests	93.76% <100.00%> (+0.12%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/SpecialFunctions.jl	100.00% <ø> (ø)
src/fresnel.jl	100.00% <100.00%> (ø)

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[curio-sitas]

Added the last test for the function fresnel(z::Number) for full code coverage (codecov)

[curio-sitas]

Thanks for the review. I used to think it was a good idea to enrich the current package since it is a global SpecialFunctions collection.

I will take your reviews into account in my next commit and may open a PR on the original repo.

[curio-sitas]

• Sign errors were corrected and some tests added (comparison with QuadGK.jl).

All above is also proposed in a PR on the original repo (FresnelIntegrals.jl).

[devmotion]

@curio-sitas I guess this PR can be closed now since the PR in FresnelIntegrals.jl was merged and released in version 0.2?

[curio-sitas]

Yes you can close it !