It would be useful if the array element separator could be defined using multiple characters (we frequently use ::). Seems reasonable to allow this for the column separator as well.

I am happy to make this change and submit a pull request.

It would be helpful to know what parts of the current API need to be preserved (and perhaps @Deprecated?). For example the inner classes CsvSchema.Builder and CsvSchema.Column are public, but don't appear to be intended for end-user use? I am assuming the method signatures on those could change without a problem. Obviously I would want to preserve mutant factory methods directly on CsvSchema.

It also appears that in this class at least, char[] is preferred? Using String would be a little more straightforward and also allow for an easy "disabled" value (empty string).

Thoughts? @cowtowncoder