Fix for event propagation canceling and better retry functionality

The retry delay of 1ms was too quick.  Modified the code to reset the retries after a successful transmission.  

The Sept 25th change to "Use mOxie's EventTarget instead of own code" broke the ability to stop event propagation. For example, I was returning false on BeforeUpload so that I could execute an AJAX request to see if the file was already partially/fully uploaded.  The AJAX request responded with the offset if it existed on server and then I would resume the file where it had left off.  The return addition to the bind function was how I got it back working for me.  I have no idea if this breaks anything else, but it fixed my issues.