commons-csv - optional encapsulator and comment characters

[Jack Nuzbit <fn...@googlemail.com>]

Hi,
I'm using commons-csv to parse the geonames database which is tab delimited
but has no encapsulator character and no comment character.

To create a CSVStrategy you currently have to provide both of these so I'm
providing characters that won't come up in the data which is ok but it's a
hack around the api.
I think it would be a good improvement to provide constructors that make
these optional.

Cheers,

Jack