Rename EMailImageLoadingPolicy to EImageLoadingPolicy and move it from EmFormat from EUtil
EHttpRequest: Remove unnecessary checks and code

In http_request_send_async don't fail when __evo-mail parameter is not in uri as
we want to allow requests that are not tight to specific message. Also
don't fail when the uri doesn't have query.
Bug 710571: [webkit-composer] Composer should honor the "Loading Images" mail preference

EEditorWidget is now redirecting http(s) requests to evo-http(s) thus
when they are going through EHttpRequest they are respecting "Loading
Images" mail preferences. Right now it lacks support for forcing the
images load.