Pinboard view updates and Pholio List

Summary: Adds hover states to pinboard-items, adds date created and author on pholio home mock.

Test Plan: Review Pholio and Macro home pages

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Maniphest Tasks: T2645

Differential Revision: https://secure.phabricator.com/D5200