All backends support

[pomadchin]

Depends on GeoTrellis master branch, server backend is now configurable (s3 / accumulo / cassandra / hadoop / file)

TODO:

• [x] accumulo ingest script
• [x] cassandra ingest script
• [ ] s3 ingest script
• [ ] hadoop ingest script
• [ ] file ingest script
• [ ] clear code

[pomadchin]

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