Add support for Syndetics Plus

tldr: I'm investigating adding support for Syndetics Plus now that it is available for use on HTTPS pages.

Syndetic Solutions (aka "Syndetics") has had an offering known as Syndetics Plus, which relies on loading a third party script on your catalog record pages (not on search result pages)

In April of 2012, support representatives confirmed that there was no support for Syndetics Plus on HTTPS pages, as there were no HTTPS endpoints from which to load the script or its content.

This made Syndetics Plus an unsuitable option for addition to the Evergreen catalog, as it would either generate mixed content warnings, or be broken (or need to be disabled) when a user was logged in or visiting the catalog via HTTPS.

In May of 2012, support confirmed that HTTPS support had been added to their development timeline, and that notification would be sent when the support was complete.

In March of 2014, we were informed that HTTPS support had been added at some unknown point in the past.

Initial brief testing confirms that Syndetics Plus is now supported on HTTPS pages.

I'm investigating adding support for Syndetics Plus now that it is available for use on HTTPS pages.