add data optimizers

[joaquimg]

Add data optimizers, useful for educational purposes. Students can implement their own simplex method, interior point, b&b and so on.

[joaquimg]

cc @guilhermebodin

[guilhermebodin]

Nice one!

[codecov-io]

Codecov Report

Merging #102 into master will decrease coverage by 2.16%. The diff coverage is 76.64%.

@@            Coverage Diff             @@
##           master     #102      +/-   ##
==========================================
- Coverage   90.29%   88.12%   -2.17%     
==========================================
  Files          12       14       +2     
  Lines        1339     1381      +42     
==========================================
+ Hits         1209     1217       +8     
- Misses        130      164      +34

Impacted Files	Coverage Δ
src/generic_optimizer.jl	0% <0%> (ø)
src/mockoptimizer.jl	91.07% <100%> (+7.4%)	:arrow_up:
src/LinQuadOptInterface.jl	98.41% <100%> (ø)	:arrow_up:
src/generic_model.jl	82.75% <82.75%> (ø)
src/solver_interface.jl	58.33% <0%> (-8.34%)	:arrow_down:
src/constraints/scalaraffine.jl	94.44% <0%> (-1.34%)	:arrow_down:
src/constraints/vectoraffine.jl	94.68% <0%> (-1.02%)	:arrow_down:
src/constraints/singlevariable.jl	97.18% <0%> (+0.72%)	:arrow_up:

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[joaquimg]

case study: https://github.com/joaquimg/RationalSimplex.jl/blob/master/src/MOI_wrapper.jl