- Added the public function "editActiveCell" 

Added the public function "editActiveCell" to make it possible to trigger editing the active cell from the outside i.e. if an external contextmenu is used to trigger editing entries this is needed
Would you mind changing this line to:

```@param	{function}	[editor]		- Editor factory to use. By default will use global editor.```

To signify that the editor param is optional?

Additionally, we should make the same change to the `makeActiveCellEditable` header as well.