Feature/edit button on results

This feature adds Edit and Destroy buttons to the search results and detailed search results. Only authorized users can see the buttons. 
After the feature is implemented I suggest we modify nyucore.rb#index, which now lists all nyucores object without pagination. 
The following files were added:
﻿app/views/catalog/_document.html.erb
app/views/catalog/_show_default.html.erb
features/edit_button_on_results.feature
feature/step_definitions/edit_button_steps.rb
The following files were modified
app/controllers/nyucore_controller.rb
feature/step_definitions/record_steps.rb


@ekate 

```
Given I am logged in as an admin
And I search for "Map"
When I click "Edit" for the first result
Then I should get to the "Edit" form
```

Clicking Edit and getting to the form presupposes there is a link to Edit, if it fails there is no link to edit, but ultimately we want to get to the edit form. If it's specifically about there being a link to "Edit" that is another scenario. When scenarios have multiple alternating `When` `Then` `When` `Then` they are usually separate scenarios.