add and check plugin base class

plugins/flattr/flattr.php

@@ -1,5 +1,5 @@
 <?php
-class Flattr {
+class Flattr extends Plugin {
 	private $link;
 	private $host;
 

plugins/googleplus/googleplus.php

@@ -1,5 +1,5 @@
 <?php
-class GooglePlus {
+class GooglePlus extends Plugin {
 	private $link;
 	private $host;
 

plugins/identica/identica.php

@@ -1,5 +1,5 @@
 <?php
-class Identica {
+class Identica extends Plugin {
 	private $link;
 	private $host;
 

plugins/mail/mail.php

@@ -1,5 +1,5 @@
 <?php
-class Mail {
+class Mail extends Plugin {
 
 	private $link;
 	private $host;

plugins/note/note.php

@@ -1,5 +1,5 @@
 <?php
-class Note {
+class Note extends Plugin {
 	private $link;
 	private $host;
 

plugins/pinterest/pinterest.php

@@ -1,5 +1,5 @@
 <?php
-class Pinterest {
+class Pinterest extends Plugin {
 	private $link;
 	private $host;
 

plugins/pocket/pocket.php

@@ -1,5 +1,5 @@
 <?php
-class Pocket {
+class Pocket extends Plugin {
 
 	private $link;
 	private $host;

plugins/redditimgur/redditimgur.php

@@ -1,5 +1,5 @@
 <?php
-class RedditImgur {
+class RedditImgur extends Plugin {
 
 	private $link;
 	private $host;

plugins/share/share.php

@@ -1,5 +1,5 @@
 <?php
-class Share {
+class Share extends Plugin {
 	private $link;
 	private $host;