Add optional parsedown module

module_index.json

@@ -151,5 +151,14 @@
         "id": "parser-default",
         "lastupdate": 1443945169,
         "optional": false
+    },
+    {
+        "name": "Parsedown",
+        "version": "0.1",
+        "author": "Johnny Broadway, Emanuil Rusev & Starbeamrainbowlabs",
+        "description": "An upgraded parser based on Emanuil Rusev's Parsedown Extra PHP library (https:\/\/github.com\/erusev\/parsedown-extra), which is licensed MIT. Also uses a modified Slimdown engine by Johnny Broadway in order to add support for internal links etc. Please be careful, as this module adds a _ton_ of weight to your installation.",
+        "id": "parser-parsedown",
+        "lastupdate": 1443961922,
+        "optional": true
     }
 ]