FSIM index

[ashwanirathee]

• 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

Attention: Patch coverage is 0% with 21 lines in your changes missing coverage. Please review.

Project coverage is 80.00%. Comparing base (a20cd6b) to head (b77cc92).
Report is 16 commits behind head on master.

Files with missing lines	Patch %	Lines
src/fsim.jl	0.00%	21 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (a20cd6b) and HEAD (b77cc92). Click for more details.

HEAD has 11 uploads less than BASE

Flag	BASE (a20cd6b)	HEAD (b77cc92)
	12	1

Additional details and impacted files

@@             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     

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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.