Tests for shiva.models.User.is_public attribute
Added is_public attribute to User model
Added is_public attribute to admin script
Improved user tests
Documentation for the User.is_public attribute
Merge pull request #147 from tooxie/public

models.User.is_public
Added GUID field
Using shiva.dbtypes.GUID type
Updated documentation on ids and slugs
Adapted admin script to uuid
Adapted URLs and resources to the new ID type
Fixes to the admin script
Slugs cannot be used as IDs any more
Removing custom slugify method
Adapted tests to new id type