allowing to pass Issue() instances instead of id/keys to issue()
allowing to pass Issue() instances instead of id/keys to issue()

stevencarey/jira,rayyen/jira,pycontribs/jira,dbaxa/jira,m42e/jira,stevencarey/jira,awurster/jira,dwmarshall/pycontribs-jira,akosiaris/jira,coddingtonbear/jira,awurster/jira,dbaxa/jira,akosiaris/jira,rayyen/jira,pycontribs/jira,milo-minderbinder/jira,coddingtonbear/jira,milo-minderbinder/jira,m42e/jira,kinow/jira,kinow/jira,VikingDen/jira,VikingDen/jira,dwmarshall/pycontribs-jira