v0.4.0

SimulatedAnnealingABC v0.4.0

Diff since v0.3.0

Merged pull requests:

• Add Differential Evolution and Stretchmove (#26) (@scheidan)

Closed issues:

• Explore multi-threading options (#14)
• build_cdf returns NaN if any distance is zero (#22)
• Wrong documentation of f_dist and alg types (#23)