Add docs for toolbar controller and pad_editbar

doc/api/editbar.md

@@ -0,0 +1,28 @@
+# Editbar
+srf/static/js/pad_editbar.js
+
+## isEnabled()
+
+## disable()
+
+## toggleDropDown(dropdown, callback)
+Shows the dropdown `div.popup` whose `id` equals `dropdown`.
+
+## registerCommand(cmd, callback)
+Register a handler for a specific command. Commands are fired if the corresponding button is clicked or the corresponding select is changed.
+
+## registerAceCommand(cmd, callback)
+Creates an ace callstack and calls the callback with an ace instance: `callback(cmd, ace)`.
+
+Example:
+```
+toolbar.registerAceCommand("insertorderedlist", function (cmd, ace) {
+  ace.ace_doInsertOrderedList();
+});
+```
+
+## registerDropdownCommand(cmd, dropdown)
+Ties a `div.popup` where `id` equals `dropdown` to a `command` fired by clicking a button.
+
+## triggerCommand(cmd[, item])
+Triggers a command (optionally with some internal representation of the toolbar item that triggered it).