FSIM index

[ashwani-rathee]

• Add FSIM index to ImageQuality Indexes
• I don't know enough on phase congruency yet , but there is some error arising from there only(something related to orientations)..need to check if the implementation is correct then can quickly writeup docs and tests
• Fixes: GMSD and FSIM index #25

[codecov]

Codecov Report

Merging #41 (b77cc92) into master (a20cd6b) will decrease coverage by 18.74%.
The diff coverage is 0.00%.

@@             Coverage Diff             @@
##           master      #41       +/-   ##
===========================================
- Coverage   98.74%   80.00%   -18.75%     
===========================================
  Files           5        6        +1     
  Lines         159      145       -14     
===========================================
- Hits          157      116       -41     
- Misses          2       29       +27     

Impacted Files	Coverage Δ
src/fsim.jl	0.00% <0.00%> (ø)
src/psnr.jl	73.68% <0.00%> (-22.15%)	⬇️
src/colorfulness.jl	85.71% <0.00%> (-14.29%)	⬇️
src/ssim.jl	98.03% <0.00%> (-1.97%)	⬇️
src/msssim.jl	100.00% <0.00%> (ø)

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[johnnychen94]

FYI, I'm starting to implement this method now. And the first step is to implement a log Gabor filter JuliaImages/ImageFiltering.jl#235. I see you tried to directly use ImagePhaseCongruency.jl, which is great. But I think that package has a strong MATLAB flavor so I prefer a native Julian reimplementation.