Fixes #14768 - Ellipsis for smart proxy name in table on index page

Fixes #14769 - avoid template comments because of deface

After many hours spent on debugging I realized that the issue is that
when action view compiles the template, some lines are concatenated
together just split by ";". This becomes problem when ERB tag contained...

Fixes #14748 - latest_events should use filters

fixes #14741 - translate template kind string, not object

Also convert translation keys to strings in debug mode to prevent
concatenation errors.

refs #14395 - change user-friendly template kind names

- PXELinux/PXEGrub to one word to match project names
- change "Provision" to "Provisioning" to read better
- change to sentence case to better match app

Fixes #14072 - Use to_hash when requesting session original_uri

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...

refs #14691 - user editing self should not change User.current

Rather than changing the behaviour of #to_label to return persisted
data, the User.current object should not be modified with unsaved data
from the form submission or API update.

User.current is used for authz as well as for display purposes, so...

Fixes #14395 - Label for provision template capitalized in os details page

s

fixes #14638 - Refactor Subnet into STI to allow different subnet types