user_id is UUID, user_name as email
index user.user_name
add a remoteidentity model
s/user_name/name
Merge pull request #3 from gdchamal/parameters

consistency around given and family name for user, and tags for contact
unused pyramid settings, use Configuration
define a NotFound exception in this package
intercept DoesNotExist exception from cqlengine and raise NotFound instead
user_id is UUID even in RawMail
Merge pull request #4 from gdchamal/user_rewrite

User rewrite, here we go