Read and write RDD to Accumulo

Filting/query is TODO
accumulo saves are more refined
Merge remote-tracking branch 'upstream/master' into feature/accumulo
Accumulo Ingest
accumulo ingest has more args
Merge pull request #855 from echeipesh/feature/accumulo

Accummulo support for geotrellis-spark
Metadata gone, test data needs to be rebuilt
Merge branch 'ingest-process', remote-tracking branch 'origin' into ingest-process
Merged accumulo, deleted metadata
Merged change to spark version.