v3.1.0

Demos for phone-generator and email-generator, countries pickers filled from the libraries, and the persona package with batches and worker pools. Every demo is built from the dasmig-core 1.2.0 releases of the libraries (name 4.2.2, city 4.1.2, entity 4.1.2, nickname/country/birth 3.1.2, biodata 4.0.1, interest/occupation 3.0.1, trait 2.1.2, phone/email 2.1.1, persona 2.0.1).