UTF-8 Multibyte (utf8mb4) support

Modify the fake JDatabaseDriverNosql driver used in unit tests to conform to the new JDatabaseDriver base class

tests/unit/suites/libraries/joomla/database/stubs/nosqldriver.php

@@ -199,6 +199,17 @@ public function getCollation()
 		return false;
 	}
 
+	/**
+	 * Method to get the database connection collation, as reported by the driver. If the connector doesn't support
+	 * reporting this value please return an empty string.
+	 *
+	 * @return  string
+	 */
+	public function getConnectionCollation()
+	{
+		return false;
+	}
+
 	/**
 	 * Get the number of returned rows for the previous executed SQL statement.
 	 *