Make use of favico an option

@tribut: does this resolve your issue?
Update title with unread count

Further discussion required on a few points:
* show notifications only or unread lines as well?
* only use this when favico is disabled, or indepently?
I welcome all feedback.

Fixes #22
Rework notifications

* Improve content of notifications
  * More descriptive title
  * The bug that caused the need for manually assembling the message has been fixed (#161 or c5e548c8ab41435dd22e7d56089fcec767bdf945)
* Permission for displaying notifications can only be requested upon user interaction in Chrome, not on page load. Bind to connect button
* Take user to g-b tab and buffer causing the notification on click
Fix the confirmation dialog when closing the tab

* Only nag if we're connected
* Set event return value so Chrome shows the dialog
Merge pull request #165 from lorenzhs/fixnag

Fix the confirmation dialog when closing the tab
Merge pull request #164 from lorenzhs/notifications

Rework notifications
Use ngAnimate to animate sidebar hiding/showing
use alt-g for filter bufferlist

this is more consistent with the other existing shortcuts and is also
the same shortcut go.py recommends in weechat-curses
use consistent format to explain shortcuts
make enter switch to the first match in the list
Notifications: Improve channel detection
Only update title for notifications, not other kinds of activity

Also make the unread count the first thing in the title
localstorage: Correctly check whether value is set before setting default

The old condition always overwrote boolean values that were set to false
with the default m( Check for undefined instead.
Merge pull request #167 from tribut/mimic-go-py

Make buffer filter more keyboard friendly
Reinitialize context when relay closes connection

Fixes #73
Merge pull request #168 from lorenzhs/notifications

Notifications: Improve channel detection
Use CSS classes instead of javascript for margin
Merge pull request #166 from torhve/swipe-animate

Use ngAnimate to animate sidebar hiding/showing
Merge pull request #169 from cormier/fix-73

Reinitialize context when relay closes connection
Merge pull request #163 from lorenzhs/flashtitle

Flash title when receiving lines in the background & make use of favico configurable