particle-swarm doc should give example of kwargs use

[jaak-s]

http://optunity.readthedocs.org/en/latest/api/optunity.solvers.html#optunity.solvers.ParticleSwarm

Might be useful to have an example of ParticleSwarm. Mainly for showing that the contents of kwargs is box constraints (currently there is also no comment about kwargs under ParticleSwarm).

[jaak-s]

Same for CMA-ES. Found out the hard way that CMA-ES uses initial state and not box constraints.