added support for session scheduling
added support for session scheduling

gentnerlab/pyoperant,gentnerlab/pyoperant,theilmbh/pyoperant,gentnerlab/pyoperant,MarvinT/pyoperant,theilmbh/pyoperant,MarvinT/pyoperant,MarvinT/pyoperant,theilmbh/pyoperant,theilmbh/pyoperant,gentnerlab/pyoperant,opyrant/opyrant,opyrant/opyrant