add missing options

lib/ace/edit_session.js

@@ -491,10 +491,7 @@ var EditSession = function(text, mode) {
     *
     **/
     this.setOverwrite = function(overwrite) {
-        if (this.$overwrite == overwrite) return;
-
-        this.$overwrite = overwrite;
-        this._emit("changeOverwrite");
+        this.setOption("overwrite", overwrite)
     };
 
     /**
@@ -2437,6 +2434,15 @@ config.defineOptions(EditSession.prototype, "session", {
         },
         initialValue: 4,
         handlesSet: true
+    },
+    overwrite: {
+        set: function(val) {this._emit("changeOverwrite");},
+        initialValue: false
+    },
+    newLineMode: {
+        set: function(val) {this.doc.setNewLineMode(val)},
+        get: function() {return this.doc.getNewLineMode(newLineMode)},
+        handlesSet: true
     }
 });