Merge pull request communiteq#8 from martinduparc/master

Added get user by external id method

Author: communiteq

lib/DiscourseAPI.php

@@ -230,6 +230,18 @@ function getUserByUsername($userName)
     {
         return $this->_getRequest("/users/{$userName}.json");
     }
+	
+    /**
+	 * getUserByExternalID
+	 *
+	 * @param string $externalID     external id of sso user
+	 *
+	 * @return mixed HTTP return code and API return object
+	 */
+	function getUserByExternalID($externalID)
+	{
+		return $this->_getRequest("/users/by-external/{$externalID}.json");
+	}
 
     /**
      * createCategory