wsk trigger update on a feed trigger calls the feed action again

is this intended new behavior?

```
wsk trigger create f --feed /whisk.system/utils/echo
```

i create a trigger with a bogus feed (need to fix #134 seeing the activation result of the feed is annoying enough i might just fix it :)

then `wsk trigger update f` and `wsk trigger get f` both call the feed - it's not clear in the first that my trigger was updates, for example to add a parameter that i specified. Further, on the get, I don't see my trigger either.

OK granted this is pathological I called an action as the feed that isn't a feed - but is this the intended behavior especially for the get?