Packaging: host the Shaarli fork on Packagist (#26)

Relates to #15

Modifications:
- [composer] update repository metadata
- [license] add the Shaarli community as a generic contributor
- [readme] add/update badges: Travis, License, GitHub release
- [readme] update general information,
           mention this repository as being a friendly community fork

Signed-off-by: VirtualTam <virtualtam@flibidi.net>

LICENSE

@@ -1,6 +1,7 @@
 The MIT License (MIT)
 
 Copyright (c) 2015-2016 Kafene and contributors
+Copyright (c) 2016      Shaarli community
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

README.md

@@ -1,10 +1,13 @@
 # netscape-bookmark-parser
-[![license](https://img.shields.io/github/license/kafene/netscape-bookmark-parser.svg?style=flat-square)](https://opensource.org/licenses/MIT)
+[![](https://img.shields.io/travis/shaarli/netscape-bookmark-parser.svg?style=flat-square&label=master)](https://travis-ci.org/shaarli/netscape-bookmark-parser)
+[![](https://img.shields.io/github/release/shaarli/netscape-bookmark-parser.svg?style=flat-square)](https://github.com/shaarli/netscape-bookmark-parser/releases/latest/)
+[![license](https://img.shields.io/github/license/shaarli/netscape-bookmark-parser.svg?style=flat-square)](https://opensource.org/licenses/MIT)
 
 
 ## About
 This library provides a generic `NetscapeBookmarkParser` class that is able
-of parsing Netscape bookmark export files.
+of parsing Netscape bookmarks as exported by common Web browsers and
+bookmarking services.
 
 The motivations behind developing this parser are the following:
 - the [Netscape format](https://msdn.microsoft.com/en-us/library/aa753582%28v=vs.85%29.aspx)
@@ -26,6 +29,14 @@ How it works:
 - an associative array containing all successfully parsed links with their
   attributes is returned
 
+### Shaarli community fork
+This friendly fork is maintained by the Shaarli community at
+https://github.com/shaarli/netscape-bookmark-parser and is used by the
+open-source [Shaarli](https://github.com/shaarli/Shaarli) bookmarking service.
+This is a community fork of the original
+[netscape-bookmark-parser](https://github.com/kafene/netscape-bookmark-parser)
+project by [Kafene](http://kafene.org/).
+
 ## Example
 Script:
 ```php

composer.json

@@ -1,8 +1,8 @@
 {
-    "name": "kafene/netscape-bookmark-parser",
+    "name": "shaarli/netscape-bookmark-parser",
     "description": "Generic Netscape bookmark parser",
     "license": "MIT",
-    "homepage": "https://github.com/kafene/netscape-bookmark-parser",
+    "homepage": "https://github.com/shaarli/netscape-bookmark-parser",
     "authors": [
         {
             "name": "Kafene",