Changes to show list of overrides on method/class summary.

- Added support to show list of overrides for Automate class and method on their respective summary screens. Moved code that sets domain overrides for instance/class/method records into one common method.
- Moved common view code to display list of overrides for class/instance/method into a common haml view. List of overrides is only displayed where any overrides exist accross domains. Rows in the list have a link to go to the respective object in the domain that is being clicked on, there is no link on the row with a domain that user is currently on.
- Fixed existing spec test to call correct method ot test get_instance_node_info and added spec tests for get_method_node_info & get_class_node_info methods.