Assorted improvements to be broken into separate issues

[jywarren]

Please help out by creating new issues for these, and linking out to them in the comments!

UI

• spinner icons <i class="fa fa-spinner fa-spin"></i> in demo before steps are complete
• click to expand for all images (pretty easy on these lines)
• (bigger) "node-and-line" style UI - like a flow-based program (Quartz Composer, Pure Data, node red (javascript!), etc)
  • visual nodes-and-lines UI: https://github.com/flowhub/the-graph
  • https://flowhub.github.io/the-graph/examples/demo-simple.html
• Possible web-based commandline interface: https://hyper.is/?

Modules

Please label these as new-feature

• (for node-and-line style UIs) non-linear sequences with Y-splitters -- ability to split an image into two sequences! (whoa)

Testing

• testing a module's promised functionality: each module could offer before/after images as part of their API; by running the module on the before image, you should get exactly the after image, comparing with an image diff (this is partially implemented, i think?)

[ccpandhare]

Histogram Module : #119
Spinner Icons : #120