Allow Family name and langs to be class variables

Use new syntax for families which dont have any other __init__ logic.
Remove unnecessary functions, which replicate the logic in Family,
or version() which is no longer needed by Site.
Add test to ensure all Family classes load and have name and langs.

Change-Id: I052164948830396bd9353bc0f044ec43159ee432
Merge "Allow Family name and langs to be class variables"