Drop node4 for devs + a few more dep updates

[etpinard]

Big bump-dep PR where

• karma gets a major bump (as promised to @alexcjohnson yesterday )
• eslint gets a major bump (and one small patch to complete the migration)
• browserify gets a major bump
• glslify gets bumped
• the color-normalize version is harmonized between our src/ and our deps to as pointed out in Fix regl-scatter2d for IE #2863 (comment)
• a few other uneventful version bumps

[etpinard]

This might look weird but we need this to make eslint@5 and npm run test-jasmine -- lib pass.

Ricky wrote:

plotly.js/test/jasmine/assets/custom_matchers.js

Lines 23 to 46 in 8517907

	// toEqual except with sparse arrays populated. This arises because:
	//
	// var x = new Array(2)
	// expect(x).toEqual([undefined, undefined])
	//
	// will fail assertion even though x[0] === undefined and x[1] === undefined.
	// This is because the array elements don't exist until assigned. Of course it
	// only fails on *some* platforms (old firefox, looking at you), which is why
	// this is worth all the footwork.
	toLooseDeepEqual: function() {
	function populateUndefinedArrayEls(x) {
	var i;
	if(Array.isArray(x)) {
	for(i = 0; i < x.length; i++) {
	if(x[i] === undefined) x[i] = undefined;
	}
	} else if(isPlainObject(x)) {
	var keys = Object.keys(x);
	for(i = 0; i < keys.length; i++) {
	populateUndefinedArrayEls(x[keys[i]]);
	}
	}
	return x;
	}

[alexcjohnson]

WOTW (wat of the week)

[alexcjohnson]

What's the story with color-rgba?

[alexcjohnson]

Oh nvm I see your commit message
it's only third-party, not used in src/ 👍

[alexcjohnson]

Keepin' up with the Joneses. 💃