Issue 92 support flat hyperparameter dictionaries

[csala]

Resolve #92

Add support for flat hyperparameter specification both on get and set hyperparameters methods.

[codecov-io]

Codecov Report

Merging #93 into master will increase coverage by 0.63%.
The diff coverage is 86.48%.

@@            Coverage Diff             @@
##           master      #93      +/-   ##
==========================================
+ Coverage   73.28%   73.92%   +0.63%     
==========================================
  Files           5        5              
  Lines         524      556      +32     
==========================================
+ Hits          384      411      +27     
- Misses        140      145       +5

Impacted Files	Coverage Δ
mlblocks/mlpipeline.py	85% <86.48%> (-0.11%)	⬇️

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