remove admin_user locale keys
Merge pull request #3416 from timoschilling/i18n_remove_admin_user

remove admin_user locale keys
Bump formastic to ~> 3.0
test against Rails 4.1.6
cleanup
Merge pull request #3431 from timoschilling/code_simplification

cleanup
Fixed markup 

Fixed markup for configuration of on_unauthorized_access
fix misspelling in CHANGELOG
simplify AssetRegistration
cleanup ActiveAdmin::Application#namespace
Merge pull request #3437 from timoschilling/simplify_asset_registration

simplify AssetRegistration
Merge pull request #3433 from macarthy/patch-2

Fixed markup
Merge pull request #3434 from timoschilling/patch-1

fix misspelling in CHANGELOG
Merge pull request #3438 from timoschilling/cleanup_application_namespace

cleanup ActiveAdmin::Application#namespace
style update in CSVBuilder
don't use !important in SVG color mixin

Previously you had to do this to use your own color:

```ruby
ActiveAdmin::Iconic.icon(:check, color: '#8daa92 !important')
```

Now you can drop the !important
Merge pull request #3432 from strivedi183/update_formastic

Bump formastic to ~> 3.0
remove old rake task
helper_method env
for example to access user agent from arbre views
add unsupported browser panel