Fix UnicodeDecodeError
Fix UnicodeDecodeError

Open binary file in binary mode. This happens in py34 because they
fixed the missing ``get_filename`` attribute of ExtensionLoader

dwillmer/jedi,flurischt/jedi,jonashaag/jedi,tjwei/jedi,jonashaag/jedi,WoLpH/jedi,mfussenegger/jedi,mfussenegger/jedi,dwillmer/jedi,flurischt/jedi,tjwei/jedi,WoLpH/jedi