Encode bugs

[shiqinfeng1]

When running Maya, some alarms will be generated, including some chinese-encoded characters. It encoded by gb2312 like this:

'\xed\xce\xf3: line 1: RuntimeError: file <maya console> line 1: \xd4\xda MAYA_PLUG_IN_PATH \xc9\xcf\xd5\xd2\xb2\xbb\xb5\xbd\xb2\xe5\xbc

when writing these warnings to file with writeWarning( ... ), it can not dump to json format.

maybe open file with specified encoding can fixs this bug：

with open(filename,'w',encoding='utf-8') as f_obj:

Last，I hope the author can consider the issue！ thanks！

[shiqinfeng1]

By the way, in function getExternalFiles(... ) of Maya, 'prjPath' name may not be "untitled". It maybe chinese-encoded characters: "无标题"。