Fill missing URL Scheme.

Now you can use just `127.0.0.1:4001` for example :)
Switch to go-log
Merge pull request #35 from sakana/master

Switch to go-log
0.0.0.0 -> 127.0.0.1

0.0.0.0 is only fittable for listening - all interfaces, it's not possible to make tcp connection to this address on windows
By the way...
Merge pull request #36 from crackcomm/patch-1

0.0.0.0 -> 127.0.0.1
Merge pull request #31 from crackcomm/patch-1

Fill missing URL Scheme.
feat(watch): add an error for user cancelled watches

Fixes https://github.com/coreos/go-etcd/pull/32
chore(watch_test): reciver to receiver
fix(watch_test): test the err return value