EXT-353 Fixes to make iframe widget work in IE

A couple of bugfixes necessary to make the legacy Capture implementation in the plugin work in different versions of Internet Explorer.

Fixes:
* A couple protocol mismatch issues between parent page and iframe
* A javascript error in IE7/8 when running String.split() over a string that doesn't containt the separator character
* A bug where users couldn't log in at all in most IE security settings because the redirect page didn't specify a compact privacy policy.