improve the document
move things around

+ moved the spec into the view_helpers folder
+ moved the `display_name` method to the top of the file
exclude association methods from `display_name` helper
Merge pull request #2119 from guangnan/master

Fix inconsistent vocabulary in the docs
Merge pull request #2147 from Daxter/bugfix/2052-exclude-associations-from-display-name-methods

[2052] Exclude associations from display name helper
Closes #2052
get auth specs running
Update the Bulgarian translation (locale :bg)
Merge pull request #2150 from mitio/bulgarian-locale

Update the Bulgarian translation (locale :bg)
Added missing translations to da.yml
Merge pull request #2154 from jokklan/patch-1

Added missing translations to da.yml
Remove Railtie, Use Rails Engine

ActiveAdmin had both a Railtie and an Engine. This commit consolidates
this duplication to use engines, and moves locale files to their
conventional location for an Engine.

This commit is a step towards resolving #2126.
Allow utility_navigation to be set to a unique component for rendering
Merge pull request #2164 from macfanatic/utility_navigation_setting

Allow utility_navigation to be set to a unique component for rendering
Merge pull request #2162 from jherdman/consolidate-engine-and-railtie

Remove Railtie, Use Rails Engine
only show empty_value for attr table if actually empty

Applying @jpmckinney's PR #1479 which never made it in.