[CORE][COMPOSER] Move extlib packages with immediate composer correspondent to composer dependencies

This adds a composer.json for all dependencies that are available

public/plugins/ShareNotice/css/README

@@ -0,0 +1,9 @@
+icon-sharing.png is from http://www.openshareicons.com/
+
+Shareaholic has made the Open Share Icon freely available for use by others under the
+Creative Commons Attribution-Share Alike 3.0 Unported License.
+
+
+icon-twitter.png is from http://twitter.com/favicon.ico and distributed under fair use
+icon-facebook.png is from http://facebook.com/favicon.ico and distributed under fair use
+icon-statusnet.png is from http://status.net/favicon.ico and distributed under fair use

public/plugins/ShareNotice/css/sharenotice.css

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+.notice-share {
+    width: 24px;
+    float: right;
+}
+
+.notice-share li a {
+    display: block;
+    width: 16px;
+    height: 16px;
+    background: url(icon-share.png) no-repeat;
+}
+.notice-share li.notice-share-twitter a {
+    background-image: url(icon-twitter.png);
+}
+.notice-share li.notice-share-facebook a {
+    background-image: url(icon-facebook.png);
+}
+.notice-share li.notice-share-statusnet a {
+    background-image: url(icon-statusnet.png);
+}
+.notice-share li a span {
+    display: none;
+}