naked link with no protocol being passed from Diaspora

doc/developer

@@ -1,18 +0,0 @@
-Friendica Developer Guide
-
-Here is how you can join us.
-
-First, get yourself a working git package on the system where you will be
-doing development.
-
-Create your own github account.
-
-Follow the instructions provided here: [[http://help.github.com/fork-a-repo/]]
-to create and use your own tracking fork on github
-
-Then go to your github page and create a "Pull request" when you are ready
-to notify us to merge your work.
-
-**Important**
-
-Please pull in any changes from the project repository and merge them with your work **before** issuing a pull request. We reserve the right to reject any patch which results in a large number of merge conflicts. This is especially true in the case of language translations - where we may not be able to understand the subtle differences between conflicting versions.   

include/oembed.php

@@ -12,6 +12,11 @@ function oembed_replacecb($matches){
 
 function oembed_fetch_url($embedurl){
 	
+	if(! strpos('://',$embedurl)) {
+		// this may be wrong but it's already wrong, we can only guess
+		$embedurl = 'http://' . $embedurl;
+	}
+
 	$txt = Cache::get($embedurl);
 
 	$noexts = array("mp3","mp4","ogg","ogv","oga","ogm","webm");