Add src value to $error image if it is available - Fixes #65

[dudeOFprosper]

Currently, the src tag in issue #65 is hard coded to always show ".." for the source. This PR will add the the src to the tag if it is available.

[jdan]

If we change the failing image in test.html to have a relative src (i.e. src="jdan.png"), we see the following:

This is somewhat problematic as it does not accurately reflect the contents of the src attribute. The reason for this is because jQuery's .prop() will resolve any URLs using the following process.

.attr() will return the actual contents of the src attribute, can we use that instead? You can even do el.getAttribute("src") and skip jQuery all together.

[jdan]

Hey @dudeOFprosper,

Thanks for tackling this one so quickly. Left a brief comment inline about .prop() if you have some time to do a follow-up. Happy to answer any questions!

Jordan

[jdan]

(and thank you for signing the CLA)

[jdan]

Awesome, thanks so much! 🌟 My apologies for the confusing JSX + ES6 template strings going on in there.

[dudeOFprosper]

@jdan thanks for the advice! I went with prop, just didn't like the $el[0].getAttribute("src") vs $el.attr("src"). But I could see arguments for either.

[jdan]

@dudeOFprosper el is there, too (then let $el = $(el); fwiw :)