Should not change localhost to '127.0.0.1'

Changing localhost to an IP forces MySQLdb to use a TCP connection, but on unix system, 'localhost' automatically makes MySQLdb use a socket connection which is preferred. If these two odd lines stay, it's impossible to setup a MySQL server with a socket :)

I've tested, and it works simply removing these two. I don't think it should be a problem, if people really wanna use TCP for the local machine, they can still write 127.0.0.1 even though it seems silly.