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See merge request !130

Update README.md

See merge request !129

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Due to bug found in previous version

```Python
XMLSchemaParseError: local list type: A type, derived by list or union, must have the simple ur-type definition as base type, not '{http://www.opengis.net/gml}doubleOrNullList'
```

From the Rotterdam Open 3d city model
- 1276 buildings
- attributes bldg:yearOfConstruction, bldg:function, bldg:storeysAboveGround, bldg:storeysBelowGround
- generic attributes gen:rotterdam_BAGid, which enables to link to open database of rotterdam with further attributes/information : http://rotterdamopendata.nl/dataset/bag-panden-met-bouwlagen-en-bouwjaren

add repository for a beta release of the PostgreSQL-based extension of the 3DCityDB for the current version of the ADE Energy (0.8.0)

Xsd validation