renamed CommandArguments to RasterArgs
Add SparkArgs and HadoopArgs
remove unused files
refactor clients of CommandArguments to use SparkArgs/HadoopArgs
add test for Spark ingest mode
Ingest bug: turn on compression for local ingest
Merge remote-tracking branch 'upstream/master' into args_parsing_changes
Ingest correctly handling of block sizes whether dest fs is local or hdfs
Merge remote-tracking branch 'upstream/master' into args_parsing_changes
Merge pull request #781 from ameetkini/args_parsing_changes

Argument Parsing refactoring and miscellaneous Ingest issues