handle socket exception in create_endpoint

[bplotnick]

This fixes #37 by catching socket.gaierror (the exception for an unresolvable name) and defaults to 127.0.0.1.

I didn't add any logging for the error, but i think it might be nice. @kaisen, is there currently a preferred way to log warnings?

[coveralls]

Coverage remained the same at 100.0% when pulling b739f35 on bplotnick:handle-socket-error into 2a6a6ef on Yelp:master.

[coveralls]

Coverage remained the same at 100.0% when pulling b739f35 on bplotnick:handle-socket-error into 2a6a6ef on Yelp:master.

[kaisen]

[bplotnick]

It looks like there's no real way to do the warning logging right now. I filed #40 to do that. This can be logged as a warning once that's done.