Chessboard

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* Make the solver into a CLI sub-command.
* Pythonize benchmarking and include it as a CLI sub-command.
* Plot n-queens graph from benchmark data.
* Switch from coveralls.io to codecov.io.

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* Only compute 2D coordinates of each piece instance when needed, so we can
reach immediately the cache if we're only interested by the territory. Adds
a 1.21x speedup.
* Add custom PEP8 configuration.
* Add custom Pylint configuration.

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* Pre-compute some Board properties. Adds a 1.12x speedup.
* Reuse Board object. Adds a 1.06x speedup.
* Use list of boolean instead of bytearray for states in Board. Adds a 1.11x
speedup.
* Add a little benchmark suite.

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* Use `bytearray` to represent board states. Closes :issue:`4`.
* Cache piece territories to speed solver up to 3x on board with big population
of pieces.

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* Do not spend time converting back and forth linear position to 2D position.
Provides a 1.16x speedup.
* Proceed permutation exploration with pieces of biggest territory coverage
first. Adds 16x speed-up. Closes :issue:`5`.
* Add support for bumpversion.
* Add new ``--profile`` option to produce an execution profile of the solver.

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* Fix rendering of unicode string in terminal.
* Document stability policy and release process.
* Add PyPi-based badges.