Add reCAPTCHA support to the badge/iframe version #332
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It appears that the reCAPTCHA support added in #311 ignored the badge/iframe version of slackin, and as it stands at the moment the badge version is unusable (see #311 (comment)). This is a problem for people wanting to update their Heroku apps because of the Node vulnerability.
This is a start at fixing it, but I'm not exactly sure how we can even support it in an iframe popup? For example: