Failed to setup kenja behind proxy

[subaru44k]

Thanks for the awesome tool!
I tried to install kenja with PC behind proxy and faced following problem.

$ python setup.py install
kenja/lib/java/java-parser.jar does not exist. Do you want to download it?[y/n]
y
md5 hash of kenja/lib/java/java-parser.jar is incorrect! remove it and tryagain.

This is because download_parser(self) method invokes urllib.urlretrieve() that does not consider proxy configuration.

    def download_parser(self):
        urllib.urlretrieve(self.parser_location, self.parser_path)

This can be modified by changing code as follows, since urllib2.urlopen() works based on http_proxy and https_proxy environment variables.

    def download_parser(self):
        with open(self.parser_path, 'wb') as f:
            f.write(urllib2.urlopen(self.parser_location).read())
            f.close()

Also I faced the similar problem on executing copy_csharp_parser() method. In this case I commented out the line and avoid the problem, since I only targets java source code in this time.