Adds Zip to the required PHP Extension check (#1146)

* Ignore .DS_Store

* Checks for required ZIP extension

.gitignore

@@ -16,4 +16,5 @@ Homestead.yaml
 .gitkeep
 /public/docs
 /.scribe
-!storage/fonts/.gitkeep
+!storage/fonts/.gitkeep
+.DS_Store

config/installer.php

@@ -27,6 +27,7 @@ return [
             'tokenizer',
             'JSON',
             'cURL',
+            'zip',
         ],
         'apache' => [
             'mod_rewrite',