GEOS5273: disabled entities evaluation for remote SLD files
GEOS5273: moved external entity setting to global configuration
GEOS5707: disabled entities evaluation in WFS POST requests
GEOS5273 - GEOS5707: created EntityResolverProvider
GEOS5273 - GEOS5707: relaxed NoExternalEntityResolver path checks for schema files
Merge pull request #193 from svzdvd/2.3.x-GEOS5273-sld-entities

GEOS-5273 and GEOS-5707 for 2.3.x