Shared-dataverse-information

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- Upgrading Django, from 1.6 to 1.10
- Add "fields" attribute to forms: MapLayerMetadataValidationForm, ShapefileImportDataForm, ClassifyRequestDataForm

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- Added default for DataverseInfo.dataset_is_public

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- ClassifyLayerForm. Label update.

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- ClassifyLayerForm. Add "Select..." as first form choice

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- Add data_source_type to ClassifyLayerForm

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- If it appears, remove "_unnamed" attribute from list of classification choices
- Added url for DELETE_TABLEJOIN