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Reading gdp datapackage results in ValueError: Cannot cast u'1968' for <Year>

See original GitHub issue

I just tried to use jsontableschema-pandas, and got an error from jsontableschema:

In [1]: import datapackage

In [2]: storage = datapackage.push_datapackage('http://data.okfn.org/data/core/gdp/datapackage.json', 'pandas')
---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
<ipython-input-2-250f172059bb> in <module>()
----> 1 storage = datapackage.push_datapackage('http://data.okfn.org/data/core/gdp/datapackage.json', 'pandas')

/home/u1/.virtualenvs/pandas/lib/python2.7/site-packages/datapackage/pushpull.pyc in push_datapackage(descriptor, backend, **backend_options)
     74     for table in storage.buckets:
     75         if table in datamap:
---> 76             storage.write(table, datamap[table])
     77     return storage
     78 

/home/u1/.virtualenvs/pandas/lib/python2.7/site-packages/jsontableschema_pandas/storage.pyc in write(self, bucket, rows)
    136         # Prepare
    137         descriptor = self.describe(bucket)
--> 138         new_data_frame = mappers.descriptor_and_rows_to_dataframe(descriptor, rows)
    139 
    140         # Just set new DataFrame if current is empty

/home/u1/.virtualenvs/pandas/lib/python2.7/site-packages/jsontableschema_pandas/mappers.pyc in descriptor_and_rows_to_dataframe(descriptor, rows)
     31     index_rows = []
     32     jtstypes_map = {}
---> 33     for row in rows:
     34         values = []
     35         index = None

/home/u1/.virtualenvs/pandas/lib/python2.7/site-packages/datapackage/pushpull.pyc in values(schema, data)
     53         # TODO: review
     54         def values(schema, data):
---> 55             for item in data:
     56                 row = []
     57                 for field in schema['fields']:

/home/u1/.virtualenvs/pandas/lib/python2.7/site-packages/datapackage/resource.pyc in _iter_from_tabulator(self, table, schema)
    330                     except JsonTableSchemaException as exception:
    331                         message = 'Cannot cast %r for <%s>' % (value, field.name)
--> 332                         six.raise_from(ValueError(message), exception)
    333             yield keyed_row
    334 

/home/u1/.virtualenvs/pandas/lib/python2.7/site-packages/six.pyc in raise_from(value, from_value)
    716 else:
    717     def raise_from(value, from_value):
--> 718         raise value
    719 
    720 

ValueError: Cannot cast u'1968' for <Year>