Composer: add shaarli/netscape-bookmark-parser

Relates to #607
Relates to kafene/netscape-bookmark-parser#6

The Shaarli-forked version is checked out as a VCS repository.

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

composer.json

@@ -9,8 +9,15 @@
         "wiki": "https://github.com/shaarli/Shaarli/wiki"
     },
     "keywords": ["bookmark", "link", "share", "web"],
+    "repositories": [
+        {
+            "type": "vcs",
+            "url": "https://github.com/shaarli/netscape-bookmark-parser"
+        }
+    ],
     "require": {
-        "php": ">=5.3.4"
+        "php": ">=5.3.4",
+        "kafene/netscape-bookmark-parser": "dev-shaarli-stable"
     },
     "require-dev": {
         "phpmd/phpmd" : "@stable",