implement uniform encoding pass

[johnnychen94]

24x faster than ImageFeatures this time

using ImageFeatures, TestImages, ImageCore

img = float32.(testimage("camera"));

@btime lbp($img, $lbp_rotation_invariant); # 36.187 ms (136 allocations: 2.01 MiB)
@btime lbp_ri($img); # 1.572 ms (8 allocations: 4.25 MiB)

[codecov]

Codecov Report

Merging #9 (e8bcf44) into master (b3544e6) will increase coverage by 0.69%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master       #9      +/-   ##
==========================================
+ Coverage   96.07%   96.77%   +0.69%     
==========================================
  Files           3        3              
  Lines          51       62      +11     
==========================================
+ Hits           49       60      +11     
  Misses          2        2              

Impacted Files	Coverage Δ
src/compat.jl	33.33% <100.00%> (+33.33%)	⬆️
src/lbp_original.jl	100.00% <100.00%> (ø)
src/utils.jl	100.00% <100.00%> (ø)

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