[Mailman-Developers] [CLI Project] Code refactored as per feedback

Hi,

As per the feedback from Steve, I have made changes to the code in following areas

• The get_listing method has been moved to the lib/utils and has been rebuilt in a class *independent* way, and it works as good as before.
• The connection checking has been moved to the connect function, without the need of making a database call, by checking the Mailman version using client.system
• The addition of CLI colors has been made more generalized by making it a module level variable, with colors stored in a separate file.
• Removed class attributes from Filter class, and changed them to arguments
• All files now have a header acknowledging the support of Google, along with the names and contacts of mentors.

Here is a link to the r70

http://bazaar.launchpad.net/~rajeevs1992/mailman.client/mailmancli/revision/...

I will be improving the error handling, as mentioned in the comments, with the next revision.