swirl operation

[ashwanirathee]

• Adds swirl operation in ImageTransformations.jl

Fixes: https://github.com/JuliaImages/ImageTransformations.jl/issues/133 Doubt:

• How to write tests for things like this?

[codecov[bot]]

Codecov Report

Merging #146 (25c2a95) into master (4d89e5c) will decrease coverage by 18.62%. The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           master     #146       +/-   ##
===========================================
- Coverage   89.06%   70.44%   -18.63%     
===========================================
  Files           8        9        +1     
  Lines         192      159       -33     
===========================================
- Hits          171      112       -59     
- Misses         21       47       +26     

Impacted Files	Coverage Δ
src/ImageTransformations.jl	66.66% <ø> (-16.67%)	:arrow_down:
src/swirl.jl	100.00% <100.00%> (ø)
src/interpolations.jl	40.90% <0.00%> (-31.10%)	:arrow_down:
src/autorange.jl	66.66% <0.00%> (-26.02%)	:arrow_down:
src/resizing.jl	76.31% <0.00%> (-23.69%)	:arrow_down:
src/compat.jl	0.00% <0.00%> (-16.67%)	:arrow_down:
src/warpedview.jl	92.30% <0.00%> (-1.81%)	:arrow_down:
src/warp.jl	100.00% <0.00%> (ø)
src/invwarpedview.jl	84.21% <0.00%> (+0.21%)	:arrow_up:

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