Not retrieving appropriate SRID in PostgisDataStore.createSchema

Whenever PostgisDataStore.createSchema(featureType) is called, it retrieves the CoordinateReferenceSystem from the provided FeatureType and must find a suitable corresponding SRID for creating the schema correctly in Postgis. However, this method was only working for CRS's that do not have identifiers, which is a problem when one is reading them from WKTs such as those coming from shapefile .prj files.

The problem was corrected by calling CRS.lookupIdentifier() if needed. A test and patch is provided for that. Two things to notice are:

• The code for retrieving the SRID was separated from the createSchema method, in order to allow it to be tested
• The pom.xml file for the Postgis module was changed to include epsg-hsql, since that is required for CRS.lookupIdentifier to work properly.

For details, see discussion at http://www.nabble.com/Correction-to-PostgisDataStore-td20256159.html