BaseSearchCV Partial Inheritance

[rodrigo-arenas]

This PR implements partially what is described in the issue #9, here is a summary:

What is done:

• The GASearchCV now has inheritance from BaseSearchCV instead of ClassifierMixin, RegressorMixin.
• This support the inherit use of methods like .predict, .predit_proba, .score and more. Check the GASearchCV documentation to see the full list. So the past hard-coded methods were removed.
• Renamed the property self.pop_size to self.population_size, this is to be consistent with the scikit-learn get_params method; for this same reason, implemented some extra properties.

What is left to do:

• Implement properties that are not yet supported, like cv_results_, best_index_ and multimetric_.
• Extra tests should be added.

[codecov[bot]]

Codecov Report

Merging #31 (d5802bf) into master (57989a6) will decrease coverage by 0.07%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #31      +/-   ##
==========================================
- Coverage   96.49%   96.42%   -0.08%     
==========================================
  Files          18       18              
  Lines         571      559      -12     
==========================================
- Hits          551      539      -12     
  Misses         20       20              

Impacted Files	Coverage Δ
sklearn_genetic/callbacks/early_stoppers.py	100.00% <ø> (ø)
sklearn_genetic/genetic_search.py	99.38% <100.00%> (-0.04%)	:arrow_down:

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