Add option that allows stripping of whitespace for all values (#19)
csv_string = CSV.generate do |csv|
csv << ["email_address ", " passcode "]
csv << [" george@vandelay_industries.com ", " bosco "]
end
result = ArtVandelay::Import.new(:users, strip: true).csv(csv_string, attributes: {email_address: :email, passcode: :password})
# => #<ArtVandelay::Import::Result>
result.rows_accepted
# => [{:row=>["george@vandelay_industries.com", "bosco"], :id=>1}]