vesion up in changelog

explicit time dependence of rates now works better

added deprecation notes

removed references to deprecated classes; fix #21

documentation

fix metadata

added possibility to call back when events happen

added routine for RGGs

rmed whitespace

added symbolic SEIR

added change in how visualizations are handled on Linux distributions

renamed variable

test change for linux

Merge pull request #19 from benmaier/dev

fix link