Using an HTTP mediacore url in an HTTPS instance results in the videos not showing

For example, using http://nicolaasmatthijs.mediacore.tv while bug-bashing on https://oae.oae-qa0.oaeproject.org.

Not sure what the best way is to handle this. Since OAE uses a secret key to communicate with MediaCore, there isn't really a case where we want this to be HTTP. We could look at the back-end config to determine if HTTP should be promoted to HTTPS at runtime.