take off actnorm from conditional glow

[rafaelorozco]

Any layer acting first on condition can be easily compsed with summarizednet. Add bit doc string

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -2.31 ⚠️

Comparison is base (cc8a408) 88.52% compared to head (0e6ebd1) 86.22%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #88      +/-   ##
==========================================
- Coverage   88.52%   86.22%   -2.31%     
==========================================
  Files          34       34              
  Lines        2589     2591       +2     
==========================================
- Hits         2292     2234      -58     
- Misses        297      357      +60     

Impacted Files	Coverage Δ
src/conditional_layers/conditional_layer_glow.jl	97.95% <100.00%> (+0.23%)	⬆️
...rc/networks/invertible_network_conditional_glow.jl	87.67% <100.00%> (-8.39%)	⬇️

... and 7 files with indirect coverage changes

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