Adds Favorite/Reminder models, migrations, assocs
Moves <li> wrapping out of thumbnail template
Rearranges items/thumbnail partial

Partial now neatly suits both the vertical 48px parent list, as well as the
longer lists that will show up on the main page.
Changes Datetime to Date in db
Fixes logged-out root page crash
Fixes overflowing text-content in main lists
Adds date restriction to list of upcoming
Lists reminders on item#show