helper function for tests checks for needle (string) in haystack (slice)
fromFile now uses a poll endpoint to emit a line at a time
Merge branch 'new-ui' of https://github.com/friej715/streamtools into new-ui
variable declaration cleanup/consistency
conditionally start tour based on query string: ?tutorial=gov for ex
Merge branch 'new-ui' of github.com:jacqui/streamtools into new-ui
Merge branch 'new-ui' of https://github.com/friej715/streamtools into new-ui

Conflicts:
	gui/static/js/tutorial.js
Merge pull request #464 from jacqui/consistent-var-declarations

variable declaration cleanup/consistency
Hide the intro text in tutorial mode
added break for speed
Check if a reader exists before allowing polling in fromFile
Merge pull request #460 from jacqui/fromfile-poll

fromFile block now uses a poll endpoint to emit a line at a time
Added todo/fixme
Merge branch 'master' into new-ui
swapping old demo for newer/cooler citibike demo (not complete)
replaced boring demo with citibike demo, plus some bugfixes