issue #53 properly set up birth rate for *BEAST start state
issue #53 properly set up birth rate for *BEAST start state

tgvaughan/beast2,Anaphory/beast2,CompEvol/beast2,tgvaughan/beast2,CompEvol/beast2,Anaphory/beast2,CompEvol/beast2,Anaphory/beast2,tgvaughan/beast2,Anaphory/beast2,tgvaughan/beast2,CompEvol/beast2