Refactor for v0.1.5

[pedromxavier]

This PR aims to close #58, close #45, close #31 and close #20.

[codecov-commenter]

Codecov Report

Base: 61.16% // Head: 70.74% // Increases project coverage by +9.57% 🎉

Coverage data is based on head (51ffe74) compared to base (787aa28).
Patch coverage: 71.67% of modified lines in pull request are covered.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master      #59      +/-   ##
==========================================
+ Coverage   61.16%   70.74%   +9.57%     
==========================================
  Files          21       24       +3     
  Lines        1146     1234      +88     
==========================================
+ Hits          701      873     +172     
+ Misses        445      361      -84     

Impacted Files	Coverage Δ
src/compiler/architectures.jl	50.00% <0.00%> (ø)
src/lib/pbo/print.jl	0.00% <0.00%> (ø)
src/model/prequbo.jl	0.00% <ø> (ø)
src/attributes/model.jl	25.00% <25.00%> (ø)
src/lib/pbo/wrapper.jl	8.69% <33.33%> (ø)
src/attributes/solver.jl	48.97% <48.97%> (ø)
src/lib/pbo/tools.jl	66.66% <58.33%> (+3.40%)	⬆️
src/attributes/compiler.jl	59.83% <59.83%> (ø)
src/lib/pbo/quadratization.jl	64.00% <64.28%> (-3.80%)	⬇️
src/model/wrapper.jl	77.77% <72.00%> (+5.31%)	⬆️
... and 14 more

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[bernalde]

This is a massive PR! Congratulations!
I left behind a couple comments which are more questions that I had. Feel free to ignore them but maybe out of them some improvements might appear.

[bernalde]

I left some more comments behind, mainly with questions and requests to open Issues based on code TODOs. Besides typos, a few comments I made during the last round need to be addressed.
Since this PR is required for the manuscript, please address the comments from @joaquimg and maybe @AndradeTiago and @pedroripper can drop a review as well.

[pedromxavier]

This PR closes #60

[pedromxavier]

Open comments were moved to #63 and JuliaQUBO/QUBOTools.jl#34.

[bernalde]

I'm very happy with this PR. I left a couple of comments behind but they are just small details for future PRs or removing emojis (sorry for being boring).
Congrats!