Merge pull request #687 from ArthurHoaro/web-thumb

Use web-thumbnailer to retrieve thumbnails

doc/md/Link-structure.md

@@ -0,0 +1,18 @@
+## Link structure
+
+Every link available through the `LinkDB` object is represented as an array 
+containing the following fields:
+
+  * `id` (integer): Unique identifier.
+  * `title` (string): Title of the link.
+  * `url` (string): URL of the link. Used for displayable links (without redirector, url encoding, etc.).  
+           Can be absolute or relative for Notes.
+  * `real_url` (string): Real destination URL, can be redirected, encoded, etc.
+  * `shorturl` (string): Permalink small hash.
+  * `description` (string): Link text description.
+  * `private` (boolean): whether the link is private or not.
+  * `tags` (string): all link tags separated by a single space
+  * `thumbnail` (string|boolean): relative path of the thumbnail cache file, or false if there isn't any.
+  * `created` (DateTime): link creation date time.
+  * `updated` (DateTime): last modification date time.
+  

doc/md/Server-configuration.md

@@ -29,7 +29,7 @@ Extension | Required? | Usage
 ---|:---:|---
 [`openssl`](http://php.net/manual/en/book.openssl.php) | All | OpenSSL, HTTPS
 [`php-mbstring`](http://php.net/manual/en/book.mbstring.php) | CentOS, Fedora, RHEL, Windows, some hosting providers | multibyte (Unicode) string support
-[`php-gd`](http://php.net/manual/en/book.image.php) | optional | thumbnail resizing
+[`php-gd`](http://php.net/manual/en/book.image.php) | optional | required to use thumbnails
 [`php-intl`](http://php.net/manual/en/book.intl.php) | optional | localized text sorting (e.g. `e->è->f`)
 [`php-curl`](http://php.net/manual/en/book.curl.php) | optional | using cURL for fetching webpages and thumbnails in a more robust way
 [`php-gettext`](http://php.net/manual/en/book.gettext.php) | optional | Use the translation system in gettext mode (faster)