Covert dates to relative moment.js dates.

Prevent default on submission on input elements with the input class
defined.
Alter mark as unread and regarding buttons.

Give the button an icon and place it to the bottom right corner of each
article. On top of that show it only when the article is hovered.
Minor code fixes and escape string handling.
Overhaul Feed Library

Move updater to separate jQuery AJAX queries.
In addition to provide an update API to update specified feeds (via
Feed ID) this can also be used as a cronjob script.

Buttons for updates, deletions and to show all articles (including the
unread articles) are now accessible by hovering the feed tiles.

Added a responsive behaviour for the Feed Library: On screens greater
than 750px the library will be displayed two-coloumned, if less it will
be one-columned.

With this commit the database inspector which showed the encrypted data
has been removed.
Add some icons.
Add jQuery updater.