Move default handling code to core
Merge pull request #639 from bradh/docs_2014_03_21

Docs 2014 03 21
Make it clear that the argument to InitOp.setConfig is a set of key/value pairs.

Strengthen the semantics of InitOp.setConfig by making it take
a Map<String, String> for the pairs of config keys and values
instead of a List<String> that it needs to parse by pairs.
Merge branch 'dwins-core-defaults'
Initial support for GeoPackage I/O.
Fix default file.

Thanks to groldan for pointing this out.
Update gpkg export to reflect API changes
Update gpkg import to reflect API changes.