Unify terminology re sessions
Unify terminology re sessions

Closes #87.

suchow/Wallace,jcpeterson/Dallinger,Dallinger/Dallinger,berkeley-cocosci/Wallace,jcpeterson/Dallinger,berkeley-cocosci/Wallace,Dallinger/Dallinger,jcpeterson/Dallinger,Dallinger/Dallinger,suchow/Wallace,berkeley-cocosci/Wallace,Dallinger/Dallinger,suchow/Wallace,jcpeterson/Dallinger,jcpeterson/Dallinger,Dallinger/Dallinger