Add method to Need to indicate if it's out of scope
Rename test helper method to make it clearer

click_on_first -> click_on_first_button

This highlights that the helper method is specifically looking for a
button.
Rename "Edit need" button to "Edit"

This is based on @fofr's design prototypes
Add dropdown menu and modal dialog for out-of-scope

This moves the "Mark as out of scope" button to a modal dialog, opened
from a new menu item called "More".
Make the out of scope notice bolder.