fixes #3107 - enable sorting of hostgroups by label, sort by default

fixes #3516 - resource names (inc. domains) are now being parametrized when used to construct urls

fixes #3622 - smart proxy features are now being loaded dynamically

fixes #3017 - split APIv2 controllers from v1 parents

fixes #3312 - support /users/extlogin as a login page based on REMOTE_USER

i18n - extracting new, updating rails, pulling from tx

Fixes #3569, #3210 - Use port from foreman_url for templates

fixes #3587, #2855 - print an error on invalid json vs 500 error

fixes #3581 - link to reports search for failed hosts should use "host = foo.example"

fixes #3578 - minor SQL and whitespaces updates to the smart proxy class