Fix "color" property of <Icon>

[micooz]

Checklist

• CircleCI
• Include tests
• Update documentation

Issues before change:

color is not handled in <Icon> because:

blueprint/packages/core/src/components/icon/icon.tsx

Lines 19 to 24 in 6cc104e

	/**
	* Color of icon. Equivalent to setting CSS `fill` property.
	*/
	color?: string;
	/**

blueprint/packages/core/src/components/icon/icon.tsx

Lines 64 to 68 in 6cc104e

	public render() {
	const { className, icon, iconSize = Icon.SIZE_STANDARD, intent, title = icon, ...svgProps } = this.props;
	if (icon == null) {
	return null;
	} else if (typeof icon !== "string") {

Changes proposed in this pull request:

This PR fixed a issue that color property doesn't work on <Icon>:

<Icon icon="add" color="red"/> // icon is now "red".

Reviewers should focus on:

If user also pass a style to the component, final style should includes user defined properties:

<Icon icon="add" color="red" style={{ color: "blue", border: "1px solid green" }}/> // icon is "red" with a green border.

Screenshot

[palantirtech]

Thanks for your interest in palantir/blueprint, @micooz! Before we can accept your pull request, you need to sign our contributor license agreement - just visit https://cla.palantir.com/ and follow the instructions. Once you sign, I'll automatically update this pull request.

[adidahiya]

I made a small code style adjustment. LGTM!

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