API for asyncagiBreak

[jmordica]

Referring to this: https://github.com/antirek/ding-dong/blob/master/API.md

1. This doesn't work. Only killing the script allows the dialplan to continue.

2. I believe it should be asyncAGIBreak instead of asyncagiBreak based on this:
   

   ding-dong/lib/command.js

   Lines 350 to 354 in b38ea9b

   	{
   	name: 'asyncAGIBreak',
   	command: 'ASYNCAGI BREAK',
   	params: 0,
   	},

BTW, I tried changing it to asyncAGIBreak and it's still not returning control to the dialplan.