make 'rev' an optional field for the git plugin
make 'rev' an optional field for the git plugin

enzochiau/peru,scalp42/peru,ierceg/peru,nivertech/peru,olson-sean-k/peru,scalp42/peru,olson-sean-k/peru,buildinspace/peru,buildinspace/peru,ierceg/peru,enzochiau/peru,nivertech/peru,oconnor663/peru,oconnor663/peru