Generated app can be deployed

Whippet expects that a deployable app is a Git repo, with
at least one commit. Previously, an app generated by Whippet
was a Git repo, but did not have any commits, and so could
not be deployed.

This commit adds a single commit to generated apps, to fix that.

Fixes #47

generators/app/generate.php

@@ -25,7 +25,8 @@ function generate() {
     }
 
     // Make the target dir a git repo, if it isn't already
-    if(!(new \Dxw\Whippet\Git\Git($this->target_dir))->is_repo()) {
+    $target_repo = new \Dxw\Whippet\Git\Git($this->target_dir);
+    if(!$target_repo->is_repo()) {
       \Dxw\Whippet\Git\Git::init($this->target_dir);
     }
 
@@ -35,6 +36,12 @@ function generate() {
 
     $this->unzipAndRemoveTemplateZip();
 
+    // Whippet deploy requires at least one commit in the repo.
+    if (!$target_repo->current_commit()) {
+      $target_repo->add("--all");
+      $target_repo->commit("Initial commit from Whippet");
+    }
+
     if(isset($this->options->repository)) {
       $this->setWPRepository();
     }