#25. fix bug. the foregin key, proposer, in Bills point to councilors.CouncilorsDetail. So we just get councilors.CouncilorsDetail.id instead of councilors.CouncilorsDetail.councilor.id.
remove useless print.
remove useless import, Councilors_Bills.
Merge pull request #67 from ya790206/issue_25

 #25. fix bug. the foregin key, proposer, in Bills point to councilors.C...