added setdefaultencoding method so reload(sys) not needed

reload(sys) could cause problem in user code - ie, sys.stdout, excepthook, and displayhook would be reset, etc

sleekxmpp/basexmpp.py

@@ -43,8 +43,8 @@ log = logging.getLogger(__name__)
 # In order to make sure that Unicode is handled properly
 # in Python 2.x, reset the default encoding.
 if sys.version_info < (3, 0):
-    reload(sys)
-    sys.setdefaultencoding('utf8')
+    from sleekxmpp.util.misc_ops import setdefaultencoding
+    setdefaultencoding('utf8')
 
 
 class BaseXMPP(XMLStream):