adding flags for compatibility w/ full https websites

When using angular-embedly on an https-enabled website, there are errors when trying to make the calls to http://embed.ly through an unsecured connection. I'm adding some flags to handle that.

For using it, one should be able to do
embedlyServiceProvider.secure(true);
to their configuration.

I left it turned off by default not to affect the current standard behavior.
Please let me know if I used the correct styling.
Hope this helps!