Hide account identities tab if there are no auth providers

If there's no configured auth providers, there's not much reason
to show this tab.
Merge pull request #1256 from jaysoffian/hide_identities_tab

Hide account identities tab if there are no auth providers
Change tag conditions to base case insensitive
Remove dead "get_version" code

This code dates back to 2aa95f5662 (Display appropriate 'best guess'
version for executing application, 2011-01-03) and is AFAICT completely
unused since at least 75ef8739fe (Move validation logic into coreapi
and remove support for legacy data, 2012-04-08).
Merge pull request #1259 from jaysoffian/remove_unused_get_version

Remove dead "get_version" code
Remove remaining unused versions code

All of this relies on Group.data["version"] which nothing appears
to populate anymore, and is being replaced in the future by a more
robust "releases" concept anyway.
Merge pull request #1260 from jaysoffian/remove_unused_get_version

Remove remaining unused versions code
Update static