add commands

- remove to line start
 - remove word left
 - remove word right

lib/ace/commands/default_commands.js

@@ -242,10 +242,22 @@ canon.addCommand({
     name: "backspace",
     exec: function(env, args, request) { env.editor.removeLeft(); }
 });
+canon.addCommand({
+    name: "removetolinestart",
+    exec: function(env, args, request) { env.editor.removeToLineStart(); }
+});
 canon.addCommand({
     name: "removetolineend",
     exec: function(env, args, request) { env.editor.removeToLineEnd(); }
 });
+canon.addCommand({
+    name: "removewordleft",
+    exec: function(env, args, request) { env.editor.removeWordLeft(); }
+});
+canon.addCommand({
+    name: "removewordright",
+    exec: function(env, args, request) { env.editor.removeWordRight(); }
+});
 canon.addCommand({
     name: "outdent",
     exec: function(env, args, request) { env.editor.blockOutdent(); }