implement VotesController#create
update redirect error
display error message
change instance variable from symbol
rename permit_param to vote_params ans erase unnecessary variable.
change method to "save" from "save!"
Merge remote-tracking branch 'origin' into feature-create-vote
set @member in create
change to instance variable
Merge pull request #51 from yochiyochirb/feature-create-vote

VotesController#createを作る