Remove PHP warning when there is no items to remove
Update of PicoFeed and PicoDb
Bugfix on empty feeds detection
Disable empty feeds check after OPML import
First version of the theme system
Update app.css

Thought the example of the CSS for Themes should have an include back to the original app.css
Merge branch 'mark-all-read' of https://github.com/doubleface/miniflux
Merge branch 'master' of https://github.com/chrislemonier/miniflux
Bugfix #91
Add comments in the example theme
Improve mark items as read
Merge branch 'master' into api
fixed issue 16 (pb with echojs)