fix browser jasmine dataset integration tests with current file loader behavior
. to run the tests, manually launch with --conf src/it/resources/it.conf --files src/it/resources/dir, then browse to localhost:1234
demos
. plot display refreshes with new plot commands
. combine demos into single line, multi-line and dashboard (both single and multi-line)
  . set SummaryMax transform for demo graphs
  . tweak display window sizes for VGA screen demos

early support for data streams over websockets
. move existing websocket echo server to /echo
. change Column.ReadRange to return both an initial and an ongoing set of data
. cassandra reader now reports ongoing writes over a stream
. send Streams response over websocket using stream api, rather than http api
. sned Update messages over websocket (only)
. add readFromStart method for half bounded ranges in cassandra

Support work
. fix intermittent test failure, apparently due to (known) scala reflection concurrency issue
. change range limit to Option[Long]
. separate cassandra store into Reader vs. Writer interfaces
. bump to current rev of Rx, didn't fix my issue, but may as well stay current.
. make transformName configurable at the series or chart level, default is "Raw"
. start on reviving assembly support in the build (some issues remain)
. fix race in head/tail of observable handling for streams/update
README points to intro slide deck