Add step.toString() and sequencer.toString() methods

[jywarren]

Breaking this out of #200 --

Based loosely on:

image-sequencer/examples/lib/defaultHtmlSequencerUi.js

Lines 30 to 37 in cbbfbff

	function removeStepUi() {
	var index = $(removeStepSel).index(this) + 1;
	sequencer.removeSteps(index).run();
	// remove from URL hash too
	var urlHash = getUrlHashParameter("steps").split(",");
	urlHash.splice(index - 1, 1);
	setUrlHashParameter("steps", urlHash.join(","));
	}

and discussion from #200

Much discussion of how to implement per-step options in #127

however this can start with just a standardized way to get a list of all current steps in a string, so:

sequencer.toString()

Right now, each image in the sequencer has its own steps, but are these all identical? I feel they ought to be -- according to our model, it should be a consistent sequence that you then pass images through, not a collection of images which you assign steps to.

So really we may need to rework this to be sequencer.steps rather than sequencer._image_name_.steps before we can continue this project.

But once this is done, we can do a follow-up where each step can return its settings, like for example: sequencer.step[0].toString() => "blur[amount:40]" or similar

[jywarren]

Here's where we're adding new steps to the URL hash string, which is similar although this code is not that flexible. With the new sequencer.toString() we could just replace the URL hash with the complete string the sequencer produces:

image-sequencer/examples/lib/defaultHtmlSequencerUi.js

Lines 42 to 45 in 1de72d7

	// add to URL hash too
	var hash = getUrlHashParameter("steps") || "";
	if (hash != "") hash += ",";
	setUrlHashParameter("steps", hash + $(addStepSel + " select").val());

[tech4GT]

@jywarren I completely get this!! Awesome!!

[tech4GT]

@jywarren should I move onto this or complete all the functions of #242 ??

[jywarren]

Yes, let's shift to this for the time being. Thanks! Thisll let us do the string configuration in the URL and such. Very useful!

…

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