this.style.backgroundImage needs quotes

[rchrd2]

I had an issue with a URL that did not load when using the sizing property. I changed the code and it works now.

Before:

        this.style.backgroundImage = this.src ? 'url(' + this.src + ')': '';

After:

        this.style.backgroundImage = this.src ? 'url("' + this.src + '")': '';

The example markup was:

<iron-image sizing="cover" style="width: 400px; height: 400px" preload src="uploads/screenshot-modesto craigslist org 2015-06-08 22-42-27.png"></iron-image>

I can submit a pull request for this if necessary.

[alefwmm]

+1. Same problem here.

[notwaldorf]

@rchrd2 A PR would be awesome! 🎉

[bicknellr]

#37

[bicknellr]

This line and this line should handle this for the image itself (when sized) and the placeholder, respectively.