Make init files copy metadata from folder.

Fixes #267.

rojo-test/serve-test-snapshots/serve_test__edit_init_all-2.snap

@@ -0,0 +1,19 @@
+---
+source: rojo-test/src/serve_test.rs
+expression: "read_response.intern_and_redact(&mut redactions, root_id)"
+---
+instances:
+  id-2:
+    Children: []
+    ClassName: ModuleScript
+    Id: id-2
+    Metadata:
+      ignoreUnknownInstances: false
+    Name: edit_init
+    Parent: ~
+    Properties:
+      Source:
+        Type: String
+        Value: "-- Edited contents"
+messageCursor: 1
+sessionId: id-1

rojo-test/serve-test-snapshots/serve_test__edit_init_all.snap

@@ -0,0 +1,19 @@
+---
+source: rojo-test/src/serve_test.rs
+expression: "read_response.intern_and_redact(&mut redactions, root_id)"
+---
+instances:
+  id-2:
+    Children: []
+    ClassName: ModuleScript
+    Id: id-2
+    Metadata:
+      ignoreUnknownInstances: false
+    Name: edit_init
+    Parent: ~
+    Properties:
+      Source:
+        Type: String
+        Value: "-- Original contents"
+messageCursor: 0
+sessionId: id-1

rojo-test/serve-test-snapshots/serve_test__edit_init_info.snap

@@ -0,0 +1,9 @@
+---
+source: rojo-test/src/serve_test.rs
+expression: redactions.redacted_yaml(info)
+---
+expectedPlaceIds: ~
+protocolVersion: 3
+rootInstanceId: id-2
+serverVersion: 0.6.0-dev
+sessionId: id-1

rojo-test/serve-test-snapshots/serve_test__edit_init_subscribe.snap

@@ -0,0 +1,18 @@
+---
+source: rojo-test/src/serve_test.rs
+expression: "subscribe_response.intern_and_redact(&mut redactions, ())"
+---
+messageCursor: 1
+messages:
+  - added: {}
+    removed: []
+    updated:
+      - changedClassName: ~
+        changedMetadata: ~
+        changedName: ~
+        changedProperties:
+          Source:
+            Type: String
+            Value: "-- Edited contents"
+        id: id-2
+sessionId: id-1