fixes #14665 - support IPv6 via API

fixes #9110 - add freeip route to API

Fixes #15225 - correct permission mapping for api puppet import

Fixes #14546 - ability to restrict *_external_variables
Fixes #14535 - corrects permissions for smart class parameters

Refs #3809 - Turning on some rubocop cops

Fixes #14877 - Adds glossary to dashboard API

Fixes #14701: Mention image password in API docs and tests

Setting the image password is well supported but not documented.

Fixes #14927 - correct override value requirment

override value should only be required when use_puppet_default is false

Fixes #14934 - Remove rails 3.2 workaround from parameter model

fixes #13244 - update Rails to 4.2.6

- Add responders gem to support class-level respond_to usage
- http://edgeguides.rubyonrails.org/4_2_release_notes.html#respond-with-class-level-respond-to
- Replace foreigner with native Rails 4.2 FK support
- uses a patch from Rails 5 to support Foreigner's...