use opendap

[aaronspring]

closes #6

either merge this PR or #8

todo:

• check whether netcdf somehow works
• check whether chunks good to provide
• check whether source can/should be explicitly given somehow

[aaronspring]

seems like it works, but takes ages

[aaronspring]

only upstream fails:

self = name: eMAST TERN
container: catalog
plugin: ['thredds_cat']
driver: ['thredds_cat']
description: THREDDS cat
direct_access: True
user_parameters: []
metadata: 
args: 
  url: http://dapds00.nci.org.au/thredds/catalogs/rr9/catalog.xml
user_parameters = {'name': 'eMAST TERN'}
plugin = <class 'intake_thredds.cat.ThreddsCatalog'>
open_args = {'metadata': {'catalog_dir': None}, 'name': 'eMAST TERN', 'url': 'http://dapds00.nci.org.au/thredds/catalogs/rr9/catalog.xml'}

    def get(self, **user_parameters):
        """Instantiate the DataSource for the given parameters"""
        if not user_parameters and self._default_source is not None:
            return self._default_source
    
        plugin, open_args = self._create_open_args(user_parameters)
>       data_source = plugin(**open_args)
E       TypeError: __init__() got an unexpected keyword argument 'name'

/opt/conda/lib/python3.7/site-packages/intake/catalog/local.py:285: TypeError

[aaronspring]

upstream fails #9 as before

[aaronspring]

dont understand the linting error. there's no newline at the end of file