Basic support for draft 3 of the http data api

  A simple StreamRequest now successfully returns a Streams object with
  data routed through the cassandra store.  it:test

  Documented current typing strategy for columns in typing.md

  Implemented justCopy - a do-nothing transform

  Cleanups
  . quiet some debug logging noise from metrics and datastax
  . add snappy and lz4 dependencies, to quiet some debug warning
  . update to latest rev of rx Observables
  . use library function rather than writing our own future to Observable conversion
  . split into SparseColumnWriter and SparseColumnReader

Better organize sub projects.

  We now have:
    nest.sparkle.time.server
    nest.sparkle.time.protocol
    nest.sparkle.time.transform
    nest.sparkle.storage
    nest.sparkle.storage.cassandra
    nest.sparkle.util
    nest.sparkle.time.legacy

  *.legacy contains the code that is not yet ported to the new apis.

revise getting started  message

return StreamsMessage not Streams over the wire

log to a file in the local directory by default.  overridable with -Dsparkle.log.dir=/my/log/dir
  log to console at warn and above

Make storage configurable in the .conf file, and launch cassandra as the default storage.

create c* event keyspace and tables for standard column types if they don't already exist.

loading .csv files into cassandra to support integration tests
  move protocol test to unit tests now that there's a non cassandra store

DomainRange transform reports the extent of a column
  add property generator test for DomainRange protocol transform.  It
  caught some failures!

initialize the database with --format option

sample dashboards 'simple' and 'db-requests' work (using the csv loader to load into cassandra)

Add cors directive and tests.

bump release version

Dropped the --debug option, it was in disrepair anyway

Simplified writing sparkle Main classes everywhere
. ArgotApp for some of the argot boilerplate
. moved sparkle initialization into ServerLaunch
. Simplify sparkle Main with support routines in ArgotApp and ConfigUtil

fix issue with default keyspace for dynamo loader

add some more copyright notices

refactor to git rid of DataServer (only ConfiguredDataServer)
drop legacy TestHttpServer test

bump version

fix issue where config file wasn't resolving environment variables