fix_duplicating_css_ids_bug: generate id with prefix
Merge pull request #1991 from joxxoxo/fix_duplicating_css_ids_bug

namespace hidden field IDs
refactor breadcrumb helper

+ ActiveRecord#find accepts a string (even when searching for a numeric ID)
+ removed unnecessary begin/rescue/end block; used nil-returning method alternatives
+ use `path` instead of `fullpath` to get rid of query parameters (we already leave them out)
Merge pull request #1938 from Daxter/refactor/breadcrumb-helper

Refactor breadcrumb helper
added admin/application_controller.rb to the install generator, changed ActiveAdmin::BaseController to inherit from Admin::ApplicationController
added application_conrtoller.rb to templates
changed authorization.rb to use the proper inheritance for BaseController