Bugfix for dexguard renamed class and method names which are not-ascii, ...

...and they were not compatible with python namespace

Example error with a dexguard obfuscated apk:

androguard/androguard/core/bytecodes/dvm.pyc in _create_python_export_class(self, _class, delete)
   7924               return
   7925             else :
-> 7926               setattr( self, name, _class )
   7927 
   7928             ### Methods

UnicodeEncodeError: 'ascii' codec can't encode character u'\u150a' in position 9: ordinal not in range(128)