GEOT-4566 Obtain complete GeoJSON FC schema

Added a new method to FeatureJSON to obtain the a feature collection schema by reading all features in search of the data types of all properties.

FeatureJSON#readFeatureCollection schema reads the {@link SimpleFeatureType} of a GeoJSON using FeatureTypeHandler, which is simpler handler when compared to FeatureHandler. In the  worst case, it will parse all features searching for attributes not present in previous features.
GEOT-4583: fixed empty Abstract and Title reading in SLDParser
Merge pull request #283 from mbarto/10x_geot_4583_null_string

SLDParser should not pass a null Abstract / Title to SimpleInternationalString when the text is empty
Move schema creation during database init, this should make the tests able to pass independent of the order they are run into
Make tests a bit more order independent
Adding Travis config file to 10.x
Close the prj reader the moment we're done reading the crs (that is, at the end of the constructor)
[GEOT-4586] Null attribute value causes NPE in SumVisitor
GEOT-4589 switch back the eclipse-maven-plugin
[GEOT-4584] ECQL.toCQL encoded divide expressions as subtract expressions
[GEOS-6051] SQLServer - native geometry serialization delivers incomplete geometry
GEOT-4579 Labels not painted with vendor option 'followLine'
[GEOT-4541] PSQLException - Postgis columns not escaped?
GEOT-4570, fixing NPE when features array is empty.

Patch contributed by Steve Ikeoka.
[Netcdf]: Adding mimetype
Merge pull request #267 from williamvoor/GEOT-4566

[GEOT-4566] Obtain complete GeoJSON FC schema
Geopackage: WFS outputformat, support multiple geometries, fix some issues.
Fix broken link from the 10.1 release
Fix for GEOT-4588 (resolving test failure on osx)
[GEOT-4538] Support repeated and randomized graphic fills in polygons