Pass custom context to commands

After reading the annyang sources, I've seen that the commands are executed in the window context, or in the annyang context. I've moved all the annyang logic in a separate js file, and my commands contains a method call, this.method();. But actually this is undefined.

Expected Behavior

It should be possible to customize the commands context, like what is already done for callbacks.

Maybe there is already a way of doing this, but I didn't find it.

Keep up with the good work ! :)