Split out matrix.js into different files. Glue things back.

Added a models directory. Added store, http-api and client files. Slowly
transitioning to the architecture outlined in SYJS-5.

lib/models/event.js

@@ -0,0 +1,37 @@
+"use strict";
+
+/*
+ * Construct a Matrix Event object
+ * @param {Object} event The raw event to be wrapped in this DAO
+ */
+function MatrixEvent(event) {
+    this.event = event || {};
+}
+MatrixEvent.prototype = {
+    getId: function() {
+        return this.event.event_id;
+    },
+    getSender: function() {
+        return this.event.user_id;
+    },
+    getType: function() {
+        return this.event.type;
+    },
+    getRoomId: function() {
+        return this.event.room_id;
+    },
+    getTs: function() {
+        return this.event.ts;
+    },
+    getContent: function() {
+        return this.event.content;
+    },
+    isState: function() {
+        return this.event.state_key !== undefined;
+    },
+};
+
+/**
+ * An event from Matrix.
+ */
+module.exports.MatrixEvent = MatrixEvent;