Mark a post as a favorite

[stevebrownlee]

As an authenticated user, I would like to specify that a post is a favorite

Given that a person has provided proper authentication details
When the person is viewing the post feed
Then there should be a white star icon beneath each post

Given the person wants to mark a post as a favorite
When the person clicks on the white star icon beneath a post
Then the post should be recorded as a favorite
And the white star should change to a yellow star to indiciate it has been favorited

Given the person wants to remove a post as a favorite
When the person clicks on the yellow star icon beneath a post
Then the post should be removed as a favorite
And the yellow star should change to a white star