Tell cascading to quote fields. Uses double quotes by default, tells Redshift to REMOVEQUOTES during COPY; release as 0.7
release 0.8: use a RedshiftSafeTextDelimited class- will check that the character values we're about to sink are within valid codepoint ranges for amazon redshift- http://docs.aws.amazon.com/redshift/latest/dg/c_Supported_data_types.html