remove: delete deployment by URL (#172)
remove: delete deployment by URL (#172)

So this now works:

```
now rm https://ffitest-hcznbannyc.now.sh
```

Fixes #87.
zeit/now-cli,zeit/now-cli,zeit/now-cli,zeit/now-cli,southpolesteve/now-cli,southpolesteve/now-cli,zeit/now-cli,zeit/now-cli,zeit/now-cli,mike-engel/now-cli