Update Database.php

Change of datatype of content
improve isMobile detection
Add share buttons (thanks a lot to Brosseau Valentin)
Merge pull request #97 from PowerIVQ/master

Change of datatype of content for MySQL
Merge branch 'master' of github.com:SSilence/selfoss
* readability is now available as spout and not as global option
* allow more html tags in articles content
readme update
Added comment (should be in facted merged with commit 399c441)
Changed to 2 column layout on wide screens (3 columns are to much for me)
Merge remote-tracking branch 'upstream/master'

Conflicts:
	config.ini
	public/js/selfoss-base.js

fedxa: I am still using the name based Tablet detection, not width based