Provides enahncement fguillot/miniflux #162 "Provide original link to any audio/video enclosures".

Essentially, if an enclosure tag exists in the item, then the item menu will contain
a link 'multimedia [speaker symbol]' to the media url. Otherwise, if there is no
enclosure tag, there is no menu item shown.

This feature required adding an enclosure column to the items table (models/schema.php)
and bumping the DB version to 21 (models/config.php). I also added enclosure tag logic
to the Rss20 parser, the model/item.php and template/item.php files.
Improve enclosure support
Fulfills enhnacement request fguillot/miniflux #155
Inserts a (unread/total)" items count in front of each subcription
on the feeds page.

models/feed.php adds two functions: get_feed_unread_counts(), get_all_w_counts().
get_feed_unread_counts - returns either an array of (unread/total) counts indexed
by feed id or a singl (unread/total) for a specific id.
get_all_w_counts() returns the same as get_all() but appends items_unread and
items_total columns.

controller/feed.php modifies Router\post_action('refresh-feed',function() to
retrun the (unread/total) count in the retruned ajax json array.
Router\get_action('feeds',function() was modified to call get_all_w_counts().

templates/feeds.php was modified to insert the (unread/total) count into the
span id="loading-feed-" such that is can be updated after a refresh.

assets/js/feed.js was modified to to have the Update and hideRefreshIcon
update the returned (unread/total) amounts in the "loading-feed" span.
Improve pull-request for unread count for each feed
Change loading icon to use an utf8 symbol
Fix php notice
Improve css/img size
Improve css for oversized images
Improve igen.fr grabber rule
Create fastcodesign.com.php

New Grabber Rules File
Create fastcoexist.com.php

New grabber rules file
Create fastcompany.com.php

New grabber rules file
Create huffingtonpost.com.php

New grabber rules file
Create treehugger.com.php

New grabber rules file
Added new function for Relative Dates
Add relative date support

Changed Date display to be relative.  If the relative date is hovered over it shows the actual date and time.
Add relative date support

Changed Date display to be relative.  If the relative date is hovered over it shows the actual date and time.
Add relative date support

Changed Date display to be relative.  If the relative date is hovered over it shows the actual date and time.
Improve HTML escaping for translations
Merge pull-request and improve relative_time() to support translations