Show unread count in the document title

Conflicts:
	public/js/selfoss-base.js
add app links to README.md
version 2.12
add titles to buttons
Merge pull request #548 from MTGap/unread-count

Show unread count in the document title
set new version
Merge pull request #551 from jtojnar/master

add titles to buttons
update README.md
Merge branch 'master' of github.com:SSilence/selfoss
update README.md
Fix the author color on smartphones
Merge pull request #552 from gerundt/fix-mobile-author-color

Fix the author color on smartphones
Translate two strings in the Hungarian translation
Merge pull request #553 from gabor-udvari/master

Translate two strings in the Hungarian translation
Fix the reload shortcut

The previous way to reload the unread article list was broken when we hit the latest element of the list.
Merge pull request #554 from c4software/patch-1

Fix the reload shortcut
Enable the App behaviour on Android.

Add the Meta "mobile-web-app-capable" to enable the App mode in Android.
Merge pull request #555 from c4software/patch-2

Enable the App behaviour on Android.
Update README.md
Update Polish translation