revert Error() api change

[op]

revert Error() api change

[op]

I was maybe a bit trigger happy and looked at the methods above and noticed that the change looked fine. But looking at the methods below, you're right. This is just so inconsistent.

[coryb]

Nice, thanks!
-Cory

[op]

@coryb Sorry but I changed it again if you've seen my recent changes in master. Please use the Infof function if you want explicit formatting. Thanks for reporting!

[coryb]

Sigh, okay. I see you just created a v1 tag, so I am going to switch to using
import "gopkg.in/op/go-logging.v1"

Hopefully you can keep the version tags moving to help us be isolated from api changes of the sort.

Thanks
-Cory