Or-testbed

^^^^^^^^^^^^^
Released in 21/9/2019

* Added levels to logger system

^^^^^^^^^^^^^
Released in 14/9/2019

* Minor fixes in examples

^^^^^^^^^^^^^
Released in 13/9/2019.

* Added Tabu Search implementation
* Added Candidate entity to model trajectory solvers
* Added Move entity to model trajectory solvers
* Added neighborhood utilities to decouple solvers
* Solvers now don't need any method overriding thanks to candidates and moves
* Added tests for solvers implemented using TSP example problem
* Moved factory logic to the classes that need it

^^^^^^^^^^^^^
Released in 6/9/2019

* Initial structure for the project.
* Added base solver and multistart approach
* Added GRASP implementation
* Added Simulated Annealing implementation