Update gem activeadmin, to v.0.6.2.
Update configuration for ActiveAdmin.

+ Command executed: `rails generate active_admin:install User`
+ For custom settings see 3883acd98f671029ebceab979096aa5f7da01863.
I18n alert message for unauthorized access to ActiveAdmin.
Update wording in ActiveAdmin specs.
Configure individual after_sign_path for superadmin and other users.
Allow editing for all Farm attributes.
Add Depot model to ActiveAdmin.
Delete duplicate devise routes declaration.
Create customized form and only show editable attributes (e.g. no user).
Generate drop down menu for enumeration 'products'.
Add drop down menu for accepts_new_members.
Add select menu for associated farms.
Merge branch 'feature/active-admin-212' into prototype