Add toggle on-off output display

[arpanbiswas52]

Created an argument on fit function for toggle on-off training output display

[codecov-commenter]

Codecov Report

Merging #62 (47c38fa) into master (5fdd8b2) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master      #62   +/-   ##
=======================================
  Coverage   74.86%   74.87%           
=======================================
  Files          63       63           
  Lines        6473     6475    +2     
=======================================
+ Hits         4846     4848    +2     
  Misses       1627     1627           

Flag	Coverage Δ
unittests	74.87% <100.00%> (+<0.01%)	⬆️

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Impacted Files	Coverage Δ
atomai/models/dgm/jrvae.py	86.25% <100.00%> (+0.35%)	⬆️

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[ziatdinovmax]

Thanks, Arpan.

A few minor comments
i) I suggest renaming disp into verbose, which is a more common name for this type of argument;
ii) I don't think it has to be an instance attribute as we don't use it anywhere outside fit.

Can you please address them and then I'll approve the merge?

[arpanbiswas52]

Changes made as per request. Please check once and approve if all look good