Add basic grey background color to days in the past.
Move "about team" collection view scroll bar to the left side.
Allign profile images on about page with top and bottom of screen.
Add "today" button to list of days.
Fix problem where leaving a period blanks the cell out.

This wasn't really a blanking problem. It was caused by the background
color changing back to white, but neglecting to also change the font
color (which was white when hilighted). So, white on white seemed like
it was getting blanked out.
Add comments for fix to "blanking" cell.

Fixes #5.