Interface to Lagrangian master method

[kibaekkim]

• Implemented a Lagrange master layer so that users can implement and use methods other than BundleMethod.jl
• Refactoring to allow parameter setting for BundleMethod.jl
• Implemented a projected subgradient method with some basic step size rules

[codecov-io]

Codecov Report

Merging #32 (15646f7) into master (4641108) will increase coverage by 12.41%. The diff coverage is 95.27%.

@@             Coverage Diff             @@
##           master      #32       +/-   ##
===========================================
+ Coverage   84.48%   96.90%   +12.41%     
===========================================
  Files           5        9        +4     
  Lines         290      355       +65     
===========================================
+ Hits          245      344       +99     
+ Misses         45       11       -34     

Impacted Files	Coverage Δ
src/DualDecomposition.jl	100.00% <ø> (ø)
src/LagrangeMaster/LagrangeMaster.jl	0.00% <0.00%> (ø)
src/LagrangeDual.jl	96.11% <100.00%> (+25.25%)	:arrow_up:
src/LagrangeMaster/BundleMethod.jl	100.00% <100.00%> (ø)
src/LagrangeMaster/SubgradientMethod.jl	100.00% <100.00%> (ø)
src/utils.jl	100.00% <100.00%> (ø)

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