Credentials: Please provide information about users service_root and/or access level

I have different credential files for different applications and access level on my system, they look like

[1]
consumer_secret =
access_token = abcdef
consumer_key = launchpadfs
access_secret = xxxxxxxxxxxxxxxxxxxxxxxx

and I'm often asking myself which launchpad service I can access on which level with credentials created by loading this file.

So it would be nice to have extra values like

service_root = https://api.staging.launchpad.net/beta/
access_level = read_public

and make the accessible like:

>>> credentials = Credentials()
>>> credentials.load(open("some-file.txt"))
>>> credentials.service_root
'https://api.staging.launchpad.net/beta/'
>>> credentials.access_level
'read_public'

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