Behat: Add test for "Pages and collections" page elements

[Rebecca Blundell]

Automating manual test. These are the details from the spreadsheet:

Overview page contains the following
* Page title - “Pages and Collections
* listing of existing pages
* default pages – Dashboard & Profile page
* side bar – user info. Online users, Tags
* section header – search, sort, add & copy button

Displays create and Copy button, Search and Sort by with drop down arrow, Edit and Delete button

Create a new test called pages_collections.feature
tag it @mainflow

Add tests that the default elements are present on the page. This does not include the header and footer elements or any functionality. These things are tested elsewhere.