Add Repo.openIndex

Author: tbranyen

generate/descriptor.json

@@ -528,6 +528,10 @@
         "ignore": false
       },
 
+      "git_repository_index": {
+        "ignore": false
+      },
+
       "git_repository_init": {
         "isConstructorMethod": true,
         "ignore": false

lib/repository.js

@@ -9,6 +9,11 @@ var Commit = require("./commit");
 var TreeBuilder = NodeGit.Treebuilder;
 var Repository = NodeGit.Repository;
 
+Object.defineProperty(Repository.prototype, "openIndex", {
+  enumerable: false,
+  value: Repository.prototype.index
+});
+
 /**
  * Look up a branch"s most recent commit.
  *