Add .ignoreProperty() to csv builder

[membersound]

I would love to add fieldnames that should be ignored, like:

mapper.schemaFor(ExternalEntity.class).withHeader().ignoreProperty('id');

I know the @JsonIgnore annotation, but that requires modifying the target class, which is not always possible.
Thus, a configuration setter would be required.

[cowtowncoder]

While I can see why it might be convenient, conceptually this is bit different from what CsvSchema is meant to define: mapping of column positions to logical name, type.

Still, I can see how some variation would perhaps make sense... would just need to think of how it maps nice to the model. I guess the idea is that definition of ignoral would essentially "hide" column value so that Databind would not see key/value pair at all.

[djay-S]

Hi,

I have raised a PR for this issue:
#418

Can you please review and suggest?

[cowtowncoder]

@membersound Can you check out #418 to see if that does what you want? It seems to me that it wouldn't (does something bit different) but I would like to know for sure.

[djay-S]

@cowtowncoder Can you have a look at my changes for #418.