[Merge] lp:~flo-fuchs/mailman.client/settings into lp:mailman.client

[Florian Fuchs]

Review: Resubmit
Hi, 

I've added a few changes to make the client compatible with the current Mailman3 alpha7. 

Member resources now use IDs instead of email adresses (on the API side). The client doesn't know this ID when provided with an email adress (for example to get membership information or to unsubscribe an email address from a list). In order to find the right ID, the client needs to iterate over the existing member roster. This probably isn't ideal, especially when lists have a large number of members. But it's probably not an issue that the client lib can solve differently...

Thanks!
Florian
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https://code.launchpad.net/~flo-fuchs/mailman.client/settings/+merge/56088
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