Notifications on medium, refining personal tools

• Setting up notifications on medium
• Changing “You have new messages” item on personal tools dropdown so

the words wrap, a couple other minor changes (e.g. color changes on
hover)

• Making “Notifications” item red when there are unread notifications

for emphasis

• Changing #mw-echo-overlay to .mw-echo-overlay (mistake in previous

commit) so the notifications dropdown disappears if you shrink the
window so small.css is enabled