users: inline search form on /users index page.

* Add the user search form to the /users page.
* Remove the /users/search page.

app/controllers/users_controller.rb

@@ -38,9 +38,6 @@ class UsersController < ApplicationController
     respond_with(@users)
   end
 
-  def search
-  end
-
   def show
     @user = authorize User.find(params[:id])
     respond_with(@user, methods: @user.full_attributes) do |format|