explicit sbt version
some notes
plugins
made tugboat.Client.Stream extendable, include a close() method in lient and define a default set of headers for every request including a tugboat/{version} User-Agent string
build info
you can't pull w/o an image so make that explicit in the method sig, the pull stream doesn't have an explicit delimiter so be optimisitic in assuming each chunk _is_ a logical/parseable chunk. better namespacing for stream reps
update readme examples and incude images.pull