Make compatible with launchpadlib 1.9.7

[Leonard Richardson]

This bug is to track any changes that need to be made to this package
to make it compatible with launchpadlib 1.9.7, the version of
launchpadlib currently in Natty. Forgive the formal tone; I'm filing a
lot of these bugs at once.

In late February, I performed an audit of this project's code and
spoke on IRC with the project maintainer, so this should not be a huge
surprise. If Natty already contains a compatible version of your
package, just mark this bug "Fix Released".

If you have any questions, feel free to respond in this bug. For a
guide to the changes in Natty's launchpadlib, see this mailing list
message:

https://lists.launchpad.net/launchpad-users/msg06239.html

My audit found the following major problem:

* This project contains a reference to the 'beta' version of the web
service, which has been deprecated since the release of Karmic
Koala. In fact, the "beta" version is about to reach its end-of-life
date. Please change the string 'https://api.launchpad.net/beta/' to
'production', and verify that your program works against a newer
version of the web service.

I also found this minor issue which can probably be resolved later, but
which might cause deprecation errors, now or in the future:

* You should be using Launchpad.login_with() instead of the Launchpad constructor.