Fixes #6606 - Allow deletion of non-admin users if 1 admin

When deleting users, you get an error message if there's only one admin account
even if the users aren't admins.
i18n - updated readme instructions
fixes #6375 - fix needed for Rails 3.2.8 only that ensures reference_id on parameter.rb matches the nested object id
fixes #5140 - User children taxonomies did not show tooltip 'Parent is already selected'
Fixes #6483 - oVirt network is properly populated for multiple datacenters
Fixes #6670 - Update fog to 1.23
fixes #6402 - use standard success/error handlers in UI controllers
Fixes #6065 - Update TopbarSweeper to clear cache for other users than User.current
Fixes #6747 - Add textarea automatic resizing
fixes #5760 - selectable VMware virtual HW version
Fixes #6633: Smart variables and smart class parameters can have the same parameter name
Fixes #6518 - look up the BMC proxy via any subnet proxies, if present
fixes #6749 - fix API v2 examples in docs that show error messages by re-ordering functional tests
fixes #6753 - fix API v1 examples in docs that show error messages by re-ordering functional tests
fixes #4181 - API V2 docs in Foreman should not specify a root node for POST/PUT