Added Active admin models.

Do not annotate controllers, helpers and scaffolds by default (revert to behavior from previous version)

Add :ignore_routes option to skip routes which should not be annotated based on regex

fix code markup in docs

Run tests by Ruby 2.3.0

Support "routes" => "true" in auto_annotate_models.rake, #245

Fix ruby wanings

Ruby 2.3 magic comments support

Annotate controllers and helpers

Fix :ignore_columns option in "auto_annotate_models" task

Correctly find annotate_models task in an unmounted engine

Add root_dir capability for multiple roots

Fix: Ignore columns not respected when the rake task is invoked