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

examples/ibb_transfer/ibb_receiver.py

@@ -21,8 +21,8 @@ import sleekxmpp
 # throughout SleekXMPP, we will set the default encoding
 # ourselves to UTF-8.
 if sys.version_info < (3, 0):
-    reload(sys)
-    sys.setdefaultencoding('utf8')
+    from sleekxmpp.util.misc_ops import setdefaultencoding
+    setdefaultencoding('utf8')
 else:
     raw_input = input
 

examples/ibb_transfer/ibb_sender.py

@@ -21,8 +21,8 @@ import sleekxmpp
 # throughout SleekXMPP, we will set the default encoding
 # ourselves to UTF-8.
 if sys.version_info < (3, 0):
-    reload(sys)
-    sys.setdefaultencoding('utf8')
+    from sleekxmpp.util.misc_ops import setdefaultencoding
+    setdefaultencoding('utf8')
 else:
     raw_input = input