start spiking out async repo

src/git-repository-async.js

@@ -0,0 +1,23 @@
+"use babel";
+
+const Git = require('nodegit')
+
+module.exports = class GitRepositoryAsync {
+  static open(path) {
+    // QUESTION: Should this wrap Git.Repository and reject with a nicer message?
+    return new GitRepositoryAsync(Git.Repository.open(path))
+  }
+
+  constructor (openPromise) {
+    this.repo = null
+    // this could be replaced with a function
+    this._opening = true
+
+    openPromise.then( (repo) => {
+      this.repo = repo
+      this._opening = false
+    }).catch( (e) => {
+      this._opening = false
+    })
+  }
+}