CSW Module : Internal Catalog - ISO MetaData Profile

The full version of the CSW Catalog. Internal Catalog with Mapping files that map Geoserver Catalog to a MetaData scheme. Full support of ISO MetaData Profile + generic support for other schemes in the future.

This pull request is depedant on this pull request on geotools:  https://github.com/geotools/geotools/pull/88