add api write test

tests/write.sh

@@ -0,0 +1,14 @@
+curl 'http://local.dear.desi:8080/api/fs/files?compiled=true&_method=PUT' \
+  -X POST \
+  -H 'Content-Type: application/json' \
+  -d '{
+        "files": [
+          { "path": "posts/foo.md"
+          , "name": "foo.md"
+          , "relativePath": "posts"
+          , "lastModifiedDate": "2013-08-01T22:47:37.000Z"
+          , "contents": "..."
+          , "sha1": "6eae3a5b062c6d0d79f070c26e6d62486b40cb46"
+          }
+        ]
+      }'