Removed unused configuration
Move feedback URL to environment variable
Use sample .env to build on Travis CI
Remove duplicated features

Navigation is covered in more detail in navigation_spec.rb.
Rename and reorganise specs

So that I know what's going on in them.
Don't let administrators delete themselves

This is embarrassing and inconvenient.
Adds 'Forgot password' link to admin login form
Adds create password reset form
Adds AdminUserMailer with password_reset mail
Adds PasswordReset model
Adds password reset token and expiry to identity
Adds `Identity#initiate_password_reset!`
Implements `Identity#initiate_password_reset!`
Makes AdminUser#password_reset use a password_reset
Fixes style errors in user model/spec
Fixes style errors in password_reset_spec.rb
Takes user to clicking a link in password reset email
Moves password reset spec to spec/features/admin/
Makes password reset happy path work as expected
Uses form_for helper in password reset form