[web-nfc] Add method for clearing all watches?

zolkis has just created a new issue for 
https://github.com/w3c/web-nfc:

== Add method for clearing all watches? ==
>From @alexshalamov: should we provide way to clear all watches? 

If developer is "sloppy" and don't save watch ids, should we provide 
way to clear _all_ watches?
Would developers use it more than single ```clearWatch()```? Or wait 
until a clear need arises?

Or just make parameter optional, and if no id provided to 
```clearWatch()```, then clear all watches?

See https://github.com/w3c/web-nfc/issues/85

Received on Tuesday, 3 November 2015 08:20:54 UTC