single value properties on iframes causes attributes property on JSON object to be incorrect

[felipeballesteros]

For example:

<iframe allowfullscreen frameborder="0" width="698" height="573" scrolling="no" id="someid" title="MailOnline Embed Player" src="http://google.com"></iframe>

has a single value property allowfullscreen (no key/value pair) which causes the JSON to output the following properties:

"0":"width"
"573":"scrolling"
"698":"height"
"MailOnline Embed Player":"src"
"molvideoplayer":"title"
"no":"id"
allowfullscreen:"frameborder"

which of course is incorrect

[ZingerDerGOD]

#19 is a potential fix for that issue

[pconerly]

fixed via #28