One set of files per feature type

[jyutzler]

I think you are missing one of the bigger frustrations with Shapefile - not only do you need multiple files to represent a single feature type but you also need one set of files per feature type so you can get an explosion in the number of files depending on your data model.

[jachym]

@jyutzler can you put this into pull request please? ;-)

[jyutzler]

Yeah okay I'll try to make a new PR for this and #24. Figure a week.