Update README and DESIGN

DESIGN.md

@@ -1,5 +1,5 @@
-# Rojo Design
-This is a super rough draft that I'm trying to use to lay out of my thoughts.
+# Rojo Design - Protocol Version 1
+This is a super rough draft that I'm trying to use to lay out some of my thoughts.
 
 ## API
 
@@ -16,5 +16,20 @@ I imagine that the `Name` attribute of the top-level `RbxItem` would be ignored
 ## CLI
 
 ### Transform Plugins
+Transform plugins (or filter plugins?) can interject in three places:
+* Transform a `VfsItem` that's being read into an `RbxItem`
+* Transform an `Rbxitem` that's being written into a `VfsItem`
+* Transform a file change into paths that need to be updated
 
-## Roblox Studio Plugin
+The plan is to have several built-in plugins that can be rearranged/configured in project settings:
+
+* Base plugin
+	* Transforms all unhandled files to/from StringValue objects
+* Script plugin
+	* Transforms `*.lua` files to their appropriate file types
+* JSON/rbxmx/rbxlx model plugin
+* External binary plugin
+	* User passes a binary name (like `moonc`) that modifies file contents
+
+## Roblox Studio Plugin
+With the protocol version 1 change, the Roblox Studio plugin got a lot simpler. Notably, the plugin doesn't need to be aware of anything about the filesystem's semantics, which is super handy.

README.md

@@ -13,6 +13,8 @@ It's designed for power users who want to use the **best tools available** for b
 
 This is the main Rojo repository, containing the binary server component. For the source for the Roblox plugin, [see the rojo-plugin repository](https://github.com/LPGhatguy/rojo-plugin).
 
+The master branches of both respositories should always pass all tests and be functional, but are not suitable for production use!
+
 ## Features
 
 Rojo has a number of desirable features *right now*: