Removes repository/vcs entries from composer.json and adds requirements (drupal-composer#3)

* Removes repository/vcs entries from composer.json and adds requirements

* Removes islandora and claw-jsonld from composer.json requirements

Author: bryjbrown

composer.json

@@ -14,18 +14,6 @@
         {
             "type": "composer",
             "url": "https://packages.drupal.org/8"
-        },
-        {
-            "type": "vcs",
-            "url": "https://github.com/Islandora-CLAW/islandora"
-        },
-        {
-            "type": "vcs",
-            "url": "https://github.com/Islandora-CLAW/islandora_collection"
-        },
-        {
-            "type": "vcs",
-            "url": "https://github.com/Islandora-CLAW/claw-jsonld"
         }
     ],
     "require": {