drhayes/impactjs-eventchain — pull request #6 by aroth (2013-11-26 04:14:44+00:00)
Title: Added thenUntil mixin, updated tests & documentation.

I found this useful in my project. Example:

```
backupTo: function( posX ){
return EventChain( this )
.then( this.face_right )
.then( this.crouch )
.thenUntil( this.backup, function(){ return ( this.pos.x + this.size.x ) <= posX } )
.then( this.crouch );
}