Implement support for turning .json files into Lua modules (#308)

* Stub implementation

* Flesh out feature and add tests. Other snapshots currently failing.

* Blacklist .meta.json in JSON handler

* Write to correct property (Source) instead of Value

* Update changelog

src/lib.rs

@@ -11,6 +11,7 @@ mod auth_cookie;
 mod change_processor;
 mod error;
 mod glob;
+mod lua_ast;
 mod message_queue;
 mod multimap;
 mod path_serializer;