Add ability to inherit custom fields from RailsAdmin::Config::Fields::Association

field.properties instance variable is lost when you configure new custom field
Update ra.filter-box.js

Use proper translation key
Merge pull request #1951 from gchaincl/master

Update ra.filter-box.js
Remove unused code

`@attr_accessible_role` is no longer used. This was probably missed in d521b54.
Merge pull request #1958 from deardaniel/master

Remove unused code
Fix disabling of array column type in AR adapter

Previously column types that matched `_array` were disabled as a Postgres specific workaround. ActiveRecord stopped using those column type names though.

Now a text array, for example, has column type of `text` and the `array` boolean attribute set to `true`. Instead of using the `DISABLED_COLUMN_MATCHERS`, we're now checking the `array` attribute.
Extract classes out of adapters
Hide association input for deeply nested fields

If they have inverse_of
Update Gemfile
Fix a random spec failure
Fix another random failure
Merge pull request #1962 from quainjn/deep_nested_association

Hide association input for deeply nested fields
Merge pull request #1960 from swalkinshaw/patch-1

Fix disabling of array column type in AR adapter
Fix one more random failure
Fix inverse of check related to nested fields
Merge pull request #1968 from quainjn/fix_nested_has_one_association

Fix inverse of check related to nested fields
Add has_description module in order to show description messages
Add description to index action.
Update rails_admin.scss.erb
Fix rubocop offenses